kanozyo ha yobi no kozeni wo saihu ni irete oku you ni site iru.

A natural breakdown is:

• 彼女は — as for her
• 予備の小銭を — spare coins / backup change (direct object)
• 財布に — into / in her wallet
• 入れておく — put in and leave there / keep in
• ようにしている — make it a habit to / try to

So the core idea is:

• 小銭を財布に入れておく = keep some coins in the wallet
• 〜ようにしている adds the idea of an ongoing habit or conscious practice

The whole sentence is describing something she habitually does.

予備 means reserve, extra, spare, or backup.

So:

• 予備の小銭 = spare coins / backup change / extra small change kept just in case

Here, 予備 is functioning like a noun, and の connects it to 小銭.

This is similar to:

• 日本語の先生 = teacher of Japanese / Japanese teacher
• 木の机 = wooden desk
• 予備の電池 = spare batteries

So 予備の小銭 literally means something like coins for backup use.

Because 予備 is a noun, and Japanese often uses noun + の + noun to connect two nouns.

Here:

• 予備 = reserve / spare
• 小銭 = small coins / change

So 予備の小銭 means spare change.

You can think of の here as linking the two nouns in a broad descriptive way. It does not always mean a strict English of; sometimes it just turns one noun into a modifier for another noun.

小銭 refers to small change, especially low-value coins used in everyday situations.

Compare:

• お金 — money in general
• 硬貨 — coins, in a more neutral or technical sense
• 小銭 — loose change / small coins

So if someone keeps 小銭 in their wallet, it suggests practical everyday coin use, like for vending machines, parking, exact payment, lockers, and so on.

小銭 often has a more familiar, everyday feel than 硬貨.

Because 小銭 is the direct object of the verb 入れる.

• 何を入れる？ — Put in what?
• 小銭を入れる — put in coins

So を marks the thing being put into the wallet.

Because に marks the destination or location into which something is put.

• 財布に入れる = put into the wallet

With verbs like 入れる, に often marks the place something goes.

Compare:

• 箱に入れる — put into a box
• かばんに入れる — put into a bag
• 冷蔵庫に入れる — put into the fridge

You may also see へ with movement in some cases, but with 入れる, に is the standard choice.

〜ておく adds the nuance of doing something in advance, or doing something and leaving it that way for future convenience.

So:

• 入れる = put in
• 入れておく = put in beforehand / keep in there for later use

In this sentence, 入れておく suggests that she puts spare coins in her wallet ahead of time so they will be available when needed.

This is a very common grammar pattern:

• 買っておく — buy in advance
• 準備しておく — prepare beforehand
• メモしておく — make a note for later

So 入れておく is more than just the physical act of putting coins in; it implies preparation.

〜ようにしている means make an effort to, try to, or make it a habit to do something.

It is often used for repeated, intentional behavior.

Examples:

• 毎日運動するようにしている。
  I make it a habit to exercise every day.

• 野菜を食べるようにしている。
  I try to eat vegetables.

• 早く寝るようにしている。
  I try to go to bed early.

So in your sentence, it means she consciously keeps this as a habit or routine.

They do related things, but they are not the same.

• 入れておく describes the action itself as a preparatory action:
  putting coins in and leaving them there for later

• ようにしている describes her ongoing habit or effort:
  she makes sure to do that regularly / as a rule

So together they mean something like:

• She has a habit of keeping spare coins in her wallet.
• She intentionally makes sure to keep spare coins in her wallet.

If you removed one part, the nuance would change:

• 財布に入れる — just put them in
• 財布に入れておく — put them in for later / keep them there
• 財布に入れておくようにしている — make it a habit to keep them there

Here, している expresses an ongoing state or habitual behavior, not just an action happening right now.

So it is not necessarily:

• She is doing it at this exact moment

Instead, it means:

• She regularly does this
• This is her habit
• This is something she makes a point of doing

This is a very common use of 〜ている in Japanese: it can describe habits, repeated actions, or continuing states.

は marks 彼女 as the topic.

So 彼女は means:

• As for her...
• She...

This tells us the sentence is about her and what she does as a habit.

If you used が instead, it would shift the nuance and potentially put more focus on her as the subject. But in a neutral sentence describing someone’s habit, は is very natural.

It can mean either, depending on context.

• 彼女 can mean she
• 彼女 can also mean girlfriend

In a sentence like this, if the meaning has already been shown to the learner as she, then that is probably the intended reading. Without context, either is possible.

Japanese often relies on context to determine which meaning is intended.

It is understandable and grammatically fine, but it does feel slightly formal or carefully constructed.

A native speaker might also say things like:

• 彼女は財布に予備の小銭を入れておくようにしている。
• 彼女は財布に小銭を少し多めに入れておくようにしている。
• 彼女はいつも財布に予備の小銭を入れている。

Your sentence is not wrong at all. It just has a somewhat deliberate explanatory feel, especially because 予備の小銭 is a bit specific.

Yes, Japanese word order is fairly flexible as long as the particles stay correct.

For example, these are all possible:

• 彼女は予備の小銭を財布に入れておくようにしている。
• 彼女は財布に予備の小銭を入れておくようにしている。

Both are natural. The second version may feel slightly smoother to some speakers because 財布に comes closer to 入れる.

Japanese often allows this kind of reordering for emphasis or flow.

Sometimes they are similar, but they are not identical.

• 〜ようにしている = make an effort to / try to / make it a habit to
• 〜ことにしている = have decided to / have a rule that one does

Compare:

• 野菜を食べるようにしている。
  I try to eat vegetables.

• 毎朝6時に起きることにしている。
  I have made it a rule to get up at 6 every morning.

In your sentence, ようにしている sounds very natural because it describes a practical habit. ことにしている could also work, but it would sound a bit more like a personal rule or policy.

It suggests an ongoing habit.

That comes mainly from ようにしている.

So the sentence is not about one specific occasion of putting coins in her wallet. It means that this is something she regularly makes sure to do.

If you wanted a one-time action, you would say something simpler, such as:

• 彼女は予備の小銭を財布に入れた。
  She put spare coins in her wallet.

But your sentence is about routine behavior.

Those spaces are just for learners. Normal Japanese writing does not usually put spaces between words like this.

So normally it would be written as:

• 彼女は予備の小銭を財布に入れておくようにしている。

The spaced version is only there to make the structure easier to see.