Moje dcera říká, že bez pasty na zuby nechce jít večer spát.

Both are correct.

• moje dcera is very common and natural in everyday speech
• má dcera is also correct, but can sound a bit shorter, more formal, or more literary

In either case, the possessive pronoun has to agree with dcera, which is feminine singular.

Because Czech normally puts a comma before a subordinate clause introduced by words like že, protože, když, and similar conjunctions.

So říká, že... is the standard written form.

Že introduces a content clause, like English that in she says that...

So the structure is:

• Moje dcera říká = my daughter says
• že ... = that ...

In English, that is often omitted, but in Czech že is usually expressed.

Czech often leaves out subject pronouns because the verb form and context already make the subject clear.

Here, nechce means doesn’t want in the he/she/it form, and from the context we know it refers to my daughter.

You could add ona for emphasis, but it is not necessary:

• ..., že ona bez pasty na zuby nechce jít večer spát.

That would sound more emphatic, like she doesn’t want to go to bed.

Because říká is the present tense of the imperfective verb říkat.

That makes it suitable for:

• what she is saying now
• what she keeps saying
• a repeated complaint or habit

Compare:

• říká = she says / is saying / keeps saying
• řekla = she said
• řekne = she will say

So říká fits naturally if the sentence reports her current or repeated statement.

The preposition bez always takes the genitive case.

The noun pasta is feminine, and its genitive singular form is pasty.

So:

• pasta = toothpaste / paste
• bez pasty = without toothpaste

This is a very important pattern in Czech:

• bez cukru = without sugar
• bez vody = without water
• bez pasty = without toothpaste

Pasta na zuby is the normal expression for toothpaste, literally paste for teeth.

Here na expresses purpose or intended use, and it takes the accusative:

• na zuby = for teeth

Zuby here is accusative plural, although it looks the same as the nominative plural.

You will also hear:

• zubní pasta

That means the same thing and is also very common.

Because chtít works with an infinitive:

• chce dělat = wants to do
• nechce dělat = doesn’t want to do

Here, the thing she doesn’t want to do is jít spát.

So the structure is:

• nechce = doesn’t want
• jít spát = to go to sleep / to go to bed

This kind of infinitive chain is normal in Czech.

Yes, but it means something slightly different.

• nechce spát = she doesn’t want to sleep
• nechce jít spát = she doesn’t want to go to bed / go to sleep

The original sentence is about bedtime, not just sleep in general, so jít spát is the better choice.

Jít spát is a very common Czech expression meaning to go to sleep or to go to bed.

Literally it is:

• jít = to go
• spát = to sleep

But together, it functions as one natural phrase for bedtime.

Very similar expressions are:

• jít domů = to go home
• jít nakupovat = to go shopping
• jít spát = to go to sleep

Because večer can function as an adverb meaning in the evening.

Czech often uses time expressions without a preposition:

• ráno = in the morning
• večer = in the evening
• včera = yesterday
• zítra = tomorrow

So jít večer spát is perfectly natural.

Depending on context, večer here can feel like in the evening or simply at bedtime tonight.

Czech word order is flexible, but it is used to manage emphasis and information flow.

The given order sounds natural and neutral:

• že bez pasty na zuby nechce jít večer spát

Other orders are possible, for example:

• že večer nechce jít spát bez pasty na zuby

But moving things changes what sounds most important or most strongly emphasized.

A useful rule for learners is:

• the sentence you have is a good neutral model
• different word orders are possible, but they are usually chosen for emphasis, contrast, or style rather than at random