No recreio, ela divide o lanche com uma amiga da turma.

Because no is the contraction of em + o.

• em o recreio → no recreio
• This is very common in Portuguese:
  • em + a = na
  • de + a = da
  • de + o = do

So no recreio literally means in the recess/break, but in natural English it is usually at recess or during recess.

In a school context, recreio usually means recess, break time, or the school break between classes.

So No recreio means something like:

• At recess
• During the break
• At break time

In Brazil, recreio is strongly associated with school life.

That is true: Portuguese often leaves out subject pronouns when the verb already makes the subject clear.

So you could also say:

• No recreio, divide o lanche com uma amiga da turma.

However, ela may still be included:

• for clarity
• for emphasis
• because the speaker wants to contrast her with someone else
• because it sounds natural in that context

So ela is not wrong or unusual here; it is just more explicit.

Here, divide comes from dividir, and in this sentence it means to share.

Literally, dividir can mean:

• to divide
• to split
• to share

With food, money, or space, Portuguese often uses dividir where English would naturally say share.

So:

• Ela divide o lanche com uma amiga = She shares her snack/lunch with a friend

Portuguese uses definite articles much more often than English.

So o lanche is very natural, even where English might simply say:

• her snack
• the snack
• lunch

Depending on context, o lanche can refer to:

• the snack she has with her
• her lunch/snack at school
• the food being eaten during the break

In Portuguese, the article often appears where English would leave it out.

Not exactly. Lanche usually means snack or light meal.

In school contexts, it can refer to:

• a snack brought from home
• a small meal eaten during break time

It does not usually mean a full lunch in the same way as almoço.

So the best translation depends on context:

• snack is often the safest choice
• sometimes lunch may fit if the school context suggests it

Because uma amiga means a friend, not a specific previously identified friend.

• com uma amiga = with a friend
• com a amiga = with the friend / with her friend in a more specific sense

So uma amiga introduces the person as one member of the group, not someone already clearly established in the conversation.

Da is the contraction of de + a.

• de a turma → da turma

Turma usually means:

• class
• group of students
• sometimes homeroom/class group

So uma amiga da turma means:

• a friend from her class
• a classmate friend
• literally, a friend of the class/group

Not exactly.

• uma colega de turma = a classmate
• uma amiga da turma = a friend from the class

So amiga adds the idea that the relationship is friendly/personal, not just that they study in the same class.

She is not merely a classmate; she is a friend who is in the same class.

Not necessarily. In Portuguese, the simple present can describe:

• something happening now
• a habitual action
• a general fact
• part of a narrative description

So ela divide o lanche com uma amiga da turma could mean:

• she is sharing her snack with a friend from her class
  or
• she shares her snack with a friend from her class

In textbook sentences like this, it often describes a habitual or typical action.

Yes. Portuguese allows some flexibility.

The original sentence:

• No recreio, ela divide o lanche com uma amiga da turma.

You could also say:

• Ela divide o lanche com uma amiga da turma no recreio.
• No recreio ela divide o lanche com uma amiga da turma.

These all sound natural. Putting No recreio first gives the time expression more prominence, like setting the scene first.

Because amiga is feminine.

• amigo = male friend / masculine form
• amiga = female friend / feminine form

Since the sentence says uma amiga, we know the friend is female.

Also notice the agreement:

• uma amiga
• a ending in both words matches the feminine gender

The written sentence is already natural, but in everyday speech Brazilians might also say things like:

• No recreio, ela divide o lanche com uma amiga da sala.
• No intervalo, ela divide o lanche com uma amiga da turma.
• Na hora do recreio, ela divide o lanche com uma amiga da turma.

Small vocabulary changes are common:

• recreio / intervalo
• turma / sala

But the original sentence is perfectly normal and clear.