Para la entrevista, mi hermana prefiere llevar el pelo en moño.

Para la entrevista means for the interview in the sense of for that occasion / with that purpose in mind.

Here, para is used because it gives the idea of context or purpose:

• Para la entrevista = for the interview, for that event

A native English speaker may wonder whether por could be used instead, but por la entrevista would usually suggest something more like because of the interview rather than for the interview.

So:

• Para la entrevista = for the interview
• Por la entrevista = because of the interview / due to the interview

Using la entrevista suggests a specific interview that both speaker and listener can identify from context.

So:

• Para la entrevista = for the interview (a particular one)
• Para una entrevista = for an interview (any interview / not specific)

Spanish often uses the definite article when the situation is already clear.

This is a very common Spanish structure.

• prefiere is a conjugated verb: she prefers
• llevar is an infinitive: to wear / to have

So prefiere llevar literally means:

• she prefers to wear
• or in this context, she prefers to have her hair...

After verbs like preferir, querer, necesitar, decidir, and many others, Spanish often uses an infinitive:

• Prefiere llevar el pelo corto
• Quiere comer
• Necesita estudiar

Prefiere is the third person singular present tense of preferir.

The subject is mi hermana, so the form must be she prefers:

• yo prefiero
• tú prefieres
• él/ella prefiere
• nosotros preferimos
• vosotros preferís
• ellos prefieren

Also, preferir is a stem-changing verb in the present tense:

• the e in the stem changes to ie in most forms

So:

• preferir → prefiere not prefera or prefera

Yes, llevar often means to carry or to take, but it also very commonly means to wear.

Examples:

• Lleva gafas = She wears glasses
• Lleva un vestido azul = She is wearing a blue dress
• Lleva el pelo corto = She wears / has her hair short

In this sentence, llevar el pelo en moño means something like:

• to wear one’s hair in a bun
• to have one’s hair up in a bun

This is a normal and natural use of llevar in Spanish.

This is a very important Spanish pattern.

With body parts, clothing, and personal items closely linked to a person, Spanish often uses the definite article instead of a possessive, especially when the owner is already obvious.

So:

• mi hermana prefiere llevar el pelo en moño literally says my sister prefers to wear the hair in a bun, but naturally means my sister prefers to wear her hair in a bun.

More examples:

• Me duele la cabeza = My head hurts
• Se lavó las manos = He washed his hands
• Lleva los ojos cerrados = She has her eyes closed

Spanish usually does not need su here because mi hermana already tells us whose hair it is.

En moño means in a bun.

A moño is a hairstyle where the hair is gathered and twisted or tied up into a bun.

So:

• llevar el pelo en moño = to wear one’s hair in a bun

This is a very common expression in Spanish, especially in Spain.

Related expressions:

• llevar el pelo suelto = to wear one’s hair down
• llevar coleta = to wear a ponytail
• llevar trenzas = to wear braids

You may sometimes hear other phrasing, but en moño is the most natural expression for this hairstyle in this structure.

• llevar el pelo en moño = standard, idiomatic
• con moño would sound less natural here if you mean the hairstyle itself

That said, con can appear in other contexts:

• Va con un moño muy elegante can work in some contexts, but it focuses more on the overall look

For a learner, the safest phrase to remember is:

• llevar el pelo en moño

Putting Para la entrevista at the beginning helps set the context right away:

• For the interview, my sister prefers...

This is very natural in Spanish. It highlights the occasion first.

You could also say:

• Mi hermana prefiere llevar el pelo en moño para la entrevista.

That version is also correct. The meaning is basically the same, but the emphasis changes slightly:

• Para la entrevista... emphasizes the situation first
• Mi hermana prefiere... emphasizes your sister first

It most naturally refers to this interview situation or that interview occasion.

Because of Para la entrevista, the sentence suggests a preference in that context:

• when it comes to the interview, she prefers to wear her hair in a bun

It does not necessarily mean that she always wears her hair that way in general.

If you wanted to express a general habit, you might say:

• Mi hermana suele llevar el pelo en moño. = My sister usually wears her hair in a bun.

Yes. This sentence is natural, but there are other common ways to express a similar idea.

For example:

• Para la entrevista, mi hermana prefiere recogerse el pelo.
  = For the interview, my sister prefers to tie her hair up.

• Para la entrevista, mi hermana prefiere hacerse un moño.
  = For the interview, my sister prefers to put her hair in a bun.

• Para la entrevista, mi hermana prefiere llevar un moño.
  = For the interview, my sister prefers to wear a bun.

Each version is slightly different:

• llevar el pelo en moño focuses on the hairstyle as the final look
• recogerse el pelo focuses on putting the hair up
• hacerse un moño focuses specifically on making a bun

Yes, moño is completely normal in Spain Spanish.

In Spain, moño is the usual word for bun as a hairstyle. Learners should know, though, that vocabulary can vary across the Spanish-speaking world, and some regions may prefer different wording or use additional expressions.

For Spain, this sentence sounds perfectly natural:

• llevar el pelo en moño

Spanish often chooses the expression that describes the resulting appearance, not just the physical action.

• atarse el pelo = to tie one’s hair
• recogerse el pelo = to put one’s hair up
• llevar el pelo en moño = to wear one’s hair in a bun

These are related, but not identical:

• atarse describes the action
• llevar describes the style being worn

So in this sentence, llevar works well because the focus is on how she wants her hair to look at the interview.