На завтрак дочка попросила смузи с киви и манго.

На завтрак means for breakfast. Here завтрак is in the accusative case.

This is a very common Russian pattern:

• на завтрак = for breakfast
• на обед = for lunch
• на ужин = for dinner

So the sentence is not saying at breakfast in the sense of location or time during the meal. It is more like as a breakfast item or for breakfast.

Compare:

• На завтрак дочка попросила смузи. = For breakfast, the daughter asked for a smoothie.
• За завтраком дочка попросила смузи. = During breakfast / while having breakfast, the daughter asked for a smoothie.

Those are close in meaning, but not identical.

Дочка is a common, everyday word for daughter. It often sounds warmer, more personal, or more natural in conversation.

• дочка = daughter, often affectionate or colloquial
• дочь = daughter, but more formal or neutral-bookish

In many ordinary family-related sentences, native speakers are very likely to say дочка.

Compare:

• Моя дочка любит манго. = My daughter loves mango.
• У неё есть дочь. = She has a daughter.

So here дочка makes the sentence sound natural and conversational.

Попросила is the past tense, feminine singular form of попросить.

Because the subject is дочка (a feminine noun), the verb in the past tense must also be feminine:

• попросил = he asked for
• попросила = she asked for
• попросило = it asked for
• попросили = they asked for

In this sentence, попросила means something like:

• asked for
• requested

So дочка попросила смузи = the daughter asked for a smoothie.

It does not necessarily mean she begged for it. It can be very ordinary: she asked a parent, a waiter, or someone preparing breakfast.

Попросила is perfective, so it presents the action as a completed single request.

That fits this sentence well: the daughter made one request for breakfast.

• попросила = asked for, made the request
• просила = was asking / asked repeatedly / used to ask

Compare:

• Дочка попросила смузи. = The daughter asked for a smoothie.
  Focus: one completed request.

• Дочка просила смузи весь день. = The daughter was asking for a smoothie all day.
  Focus: duration or repeated asking.

So попросила is the natural choice here.

Смузи is a borrowed word, and in modern Russian it is usually treated as an indeclinable noun. That means it keeps the same form in different cases.

So even though it is the direct object here, it still stays смузи.

For example:

• Это смузи.
• Я люблю смузи.
• Она попросила смузи.

Same form each time.

This is common with some loanwords in Russian.

Yes, с meaning with normally requires the instrumental case.

However, киви and манго are also typically indeclinable nouns, so their instrumental form looks the same as the basic form.

So:

• с киви
• с манго

are correct.

You can see the difference with a noun that does decline:

• с бананом = with banana
• с яблоком = with apple

So the case rule is still there; it is just that these particular nouns do not visibly change.

Not exactly.

• с киви и манго = with kiwi and mango
• из киви и манго = made from kiwi and mango

In food descriptions, Russian often uses с to talk about ingredients, additions, or flavor components:

• йогурт с клубникой = yogurt with strawberries / strawberry yogurt
• каша с яблоками = porridge with apples
• смузи с киви и манго = smoothie with kiwi and mango

If you say из киви и манго, you emphasize what it is made out of. That can also be possible in some contexts, but с киви и манго sounds very natural for naming the type of smoothie.

Russian has no articles like English a or the.

So смузи by itself can mean:

• a smoothie
• the smoothie

depending on context.

In this sentence, English would usually translate it as a smoothie, because that sounds natural. But Russian does not need a separate word for that.

Yes, you could. Russian word order is more flexible than English word order.

The original sentence:

• На завтрак дочка попросила смузи с киви и манго.

puts на завтрак first, which sets the scene or topic: as for breakfast / for breakfast.

A different order is also possible:

• Дочка попросила на завтрак смузи с киви и манго.
• Дочка попросила смузи с киви и манго на завтрак.

These versions are all understandable, but they may shift the emphasis slightly.

The original order sounds very natural if the speaker wants to begin with the breakfast context.

Yes. Попросила is broad enough for both.

It can mean:

• she asked someone at home to give or make her a smoothie
• she requested it in a restaurant or café
• she asked for it in some other everyday situation

Russian does not specify that automatically. The wider context would tell you who she asked.

С киви и манго describes what kind of smoothie it was.

So the structure is:

• смузи = smoothie
• с киви и манго = with kiwi and mango

Together:

• смузи с киви и манго = a smoothie with kiwi and mango

This phrase is attached to смузи, not to попросила. In other words, it is not saying she asked with kiwi and mango; it is saying she asked for a smoothie that had kiwi and mango.