A la nit, la meva filla vol menjar fruita.

It means at night or in the evening/nighttime, depending on context.

In Catalan, expressions with parts of the day often use a:

• al matí = in the morning
• a la tarda = in the afternoon
• a la nit = at night

A learner may also see de nit, which can also mean at night, but a la nit is very common for saying when something happens.

Because nit is feminine, so it takes la:

• la nit = the night

The contraction al only happens with a + el:

• a + el matí → al matí

But with a + la, there is no contraction:

• a + la nit → a la nit

Catalan normally uses the definite article before a possessive + noun:

• la meva filla = my daughter
• el meu pare = my father
• la nostra casa = our house

So the article is not extra emphasis here; it is just the normal Catalan pattern.

Because the possessive agrees with the noun it goes with, not with the speaker.

Since filla is feminine singular, you need the feminine singular form:

• meu = masculine singular
• meva = feminine singular
• meus = masculine plural
• meves = feminine plural

So:

• el meu fill = my son
• la meva filla = my daughter

Vol is the 3rd person singular present of voler, which means to want.

Here it matches la meva filla:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants

So la meva filla vol means my daughter wants.

After voler, Catalan uses the infinitive directly:

• vol menjar = wants to eat
• vull dormir = I want to sleep
• volen sortir = they want to go out

So English to is not translated here with a separate word.

This is important because some Catalan verbs do use a preposition before the infinitive, but voler does not.

Because fruita here means fruit in general, not a specific fruit or a specific batch of fruit.

So:

• menjar fruita = to eat fruit / eat some fruit in general

But if you mean specific fruit, you would use the article:

• menjar la fruita = eat the fruit

This is similar to the difference between eat fruit and eat the fruit in English.

In Catalan, fruita is often used as a mass noun, like fruit in English when you mean it generally.

So:

• menjar fruita = eat fruit

If you say fruites, that usually sounds more like fruits, types of fruit, or pieces of fruit:

• menja fruites tropicals = she eats tropical fruits

In this sentence, fruita is the most natural general choice.

Yes. That is also correct.

Catalan word order is fairly flexible. The version with A la nit at the beginning puts the time expression first, which gives it a little more prominence:

• A la nit, la meva filla vol menjar fruita.
• La meva filla vol menjar fruita a la nit.

Both are natural. The first one highlights when a bit more.

The comma is there because A la nit has been moved to the front as an introductory time phrase.

In writing, Catalan often uses a comma after this kind of fronted element:

• A la nit, la meva filla vol menjar fruita.

If the time phrase stays at the end, there is no comma:

• La meva filla vol menjar fruita a la nit.

So the comma helps mark the sentence structure clearly.