Možda ona zna odgovor.

That is true: Serbian often omits subject pronouns because the verb ending already shows the person.

So Možda zna odgovor. is also perfectly natural and means Maybe she knows the answer if the context makes it clear who she is.

Including ona can:

• add emphasis
• make the subject clearer
• create a contrast, as in Maybe she knows the answer, not him

So in this sentence, ona is not required, but it is completely correct.

Možda means maybe or perhaps.

It often appears near the beginning of the sentence:

• Možda ona zna odgovor.
• Možda zna odgovor.

But Serbian word order is flexible, so you may also hear:

• Ona možda zna odgovor.

The meaning stays basically the same, though the emphasis can shift slightly depending on placement.

Zna is the 3rd person singular present tense of the verb znati (to know).

So:

• ja znam = I know
• ti znaš = you know
• on/ona/ono zna = he/she/it knows
• mi znamo = we know
• vi znate = you (plural/formal) know
• oni/one/ona znaju = they know

In Možda ona zna odgovor, zna matches ona (she).

It is in the accusative here, but for this noun, the nominative and accusative singular look the same.

Odgovor is a masculine inanimate noun. In Serbian, masculine inanimate nouns usually have:

• nominative singular: odgovor
• accusative singular: odgovor

So:

• Odgovor je tačan. = The answer is correct.
  (odgovor = nominative, subject)
• Ona zna odgovor. = She knows the answer.
  (odgovor = accusative, direct object)

The form does not change, but the function does.

Serbian has no articles, so there is no direct equivalent of the or a/an.

That means odgovor can mean:

• the answer
• an answer

The exact meaning depends on context.

In a sentence like this, English often chooses the answer because that sounds most natural, but Serbian itself does not mark definiteness with an article.

Yes, grammatically it could, because odgovor has no article.

However, in normal context, Možda ona zna odgovor is more naturally understood as:

• Maybe she knows the answer

If you specifically wanted an answer, the broader context would usually make that clear.

Yes, znati is exactly the right verb here.

Znati is used for:

• knowing facts or information
• knowing people
• knowing how, in some contexts

Examples:

• Znam odgovor. = I know the answer.
• Znam Petra. = I know Petar.

Umeti usually means to know how to / be able to do something skillfully:

• Umem da plivam. = I know how to swim / I can swim.

So in Možda ona zna odgovor, the meaning is about knowing information, so znati is correct.

In this sentence, ona is the nominative singular feminine pronoun, so it means she.

Serbian distinguishes gender in the third person singular:

• on = he
• ona = she
• ono = it

Because zna is singular, ona must mean she here.

Yes, Serbian word order is quite flexible, and those versions are possible.

But changing the order usually changes the focus or emphasis, not the basic meaning.

For example:

• Možda ona zna odgovor. = neutral, natural
• Ona možda zna odgovor. = slightly more focus on she
• Možda zna ona odgovor. = more conversational, stronger emphasis on she
• Odgovor možda ona zna. = strong focus on the answer

For learners, the most neutral version is the original one:

• Možda ona zna odgovor.

The letter ž is pronounced like the s in measure or the g in genre.

So:

• možda sounds approximately like MOZH-da
• zna begins with zn-, as in a voiced z followed by n
• odgovor is roughly OD-go-vor

A rough full pronunciation guide would be:

• MOZH-da O-na zna OD-go-vor

Very often, yes in meaning, but not in grammar.

English can say:

• Maybe she knows the answer.
• She may know the answer.

Serbian usually uses možda as an adverb:

• Možda ona zna odgovor.

So the idea is similar to English may/maybe, but Serbian expresses it with možda, not with a separate modal verb in this sentence structure.

It can mean both answer and reply, depending on context.

For example:

• Znam odgovor. = I know the answer.
• Čekam odgovor. = I’m waiting for a reply / answer.

In your sentence, odgovor is most naturally understood as the answer.