Su hija tiene el pelo rubio y muy largo.

In Spanish, su is a third-person possessive that covers several English possibilities:

• his daughter
• her daughter
• your daughter (formal singular: *usted)*
• their daughter
• your daughter (formal plural in some contexts: *ustedes)*

Spanish often leaves this ambiguous unless the context makes it clear. If you need to clarify, Spanish can use:

• la hija de él = his daughter
• la hija de ella = her daughter
• la hija de ellos = their daughter

So in Su hija tiene el pelo rubio y muy largo, su hija could mean several things depending on context.

Spanish often uses the definite article (el, la, los, las) with body parts and clothing when the owner is already obvious.

So instead of saying:

• su pelo = her/his hair

Spanish very naturally says:

• el pelo = the hair

Because su hija tiene... already tells you whose hair is being described: the daughter’s.

This is very common in Spanish:

• Me duele la cabeza. = My head hurts.
• Tiene los ojos azules. = He/She has blue eyes.
• Lleva la chaqueta azul. = He/She is wearing his/her blue jacket.

Using su pelo is possible in some situations, but el pelo sounds more natural here.

Because the sentence is describing the hair, not the daughter herself.

• Su hija tiene el pelo rubio y muy largo.
  = Her daughter has blond, very long hair.

If you said:

• Su hija es rubia.
  = Her daughter is blonde.

That part is fine, because rubia can describe a person.

But:

• Su hija es muy larga
  would sound wrong, because it would mean the daughter herself is very long, not that her hair is long.

So Spanish often uses tener + el pelo + adjective when talking about someone’s hair:

• Tiene el pelo corto. = He/She has short hair.
• Tiene el pelo rizado. = He/She has curly hair.

Because both adjectives describe el pelo, and pelo is a masculine singular noun.

So the adjectives must agree with pelo:

• el pelo rubio
• el pelo largo

Even though hija is feminine, the adjectives are not describing hija here. They are describing pelo.

Compare:

• Su hija es rubia.
  Here rubia describes hija, so it is feminine.

• Su hija tiene el pelo rubio.
  Here rubio describes pelo, so it is masculine.

In Spanish, adjectives usually come after the noun.

So:

• el pelo rubio
• el pelo largo

When there is more than one adjective, they often stay after the noun as well:

• el pelo rubio y muy largo

This is the normal order in Spanish. English often puts adjectives before the noun (blonde hair, long hair), but Spanish usually puts them after.

Because muy is used to mean very before an adjective or adverb.

• muy largo = very long
• muy rubio = very blond
• muy bien = very well

Mucho usually means much / a lot / many, and it does not work here before an adjective.

Compare:

• muy largo = very long
• mucho pelo = a lot of hair
• come mucho = he/she eats a lot

So muy is the correct word before largo.

Yes, absolutely. That is very natural Spanish.

There is a slight difference in focus:

• Su hija tiene el pelo rubio y muy largo.
  Focuses on the hair as a whole: it is blond and very long.

• Su hija es rubia y tiene el pelo muy largo.
  First describes the daughter as blonde, then separately says her hair is very long.

Both are correct. The original sentence is simply a compact way of describing the hair.

Usually yes, but its exact use can vary a bit.

In Spanish, rubio/rubia commonly refers to fair/blond hair. Depending on context, it can cover shades from light blond to dark blond/light brown more broadly than English sometimes does.

So in learning terms:

• rubio / rubia = blond(e)

That is the best normal translation in this sentence.

Because the structure is not the hair is blond and long. The structure is:

• Su hija = his/her daughter
• tiene = has
• el pelo rubio y muy largo = blond and very long hair

Spanish is using tener (to have) to describe a characteristic of someone’s hair.

English often does something similar:

• She has long hair.
• He has brown eyes.

So the adjectives are part of the description of el pelo, and no extra is is needed.

You sometimes can say tiene pelo rubio y muy largo, but it changes the feel slightly.

• tiene el pelo rubio y muy largo
  = the most natural and common way to describe someone’s hair in general

• tiene pelo rubio y muy largo
  = possible, but it can sound a bit more like she has blond, very long hair in a more indefinite or descriptive sense

For beginners, tener el pelo + adjective is the safest and most natural pattern to learn.

In Spain, hija is pronounced approximately like:

• EE-ha

More accurately:

• the h is silent
• the j has a strong throaty sound, like the ch in Scottish loch or German Bach
• stress falls on the first syllable: HI-ja

So:

• hija ≈ EE-kha / EE-ha, depending on how you approximate the Spanish j

The sentence follows this pattern:

• Su hija = subject
• tiene = verb
• el pelo rubio y muy largo = direct object + description

You can think of it as:

[Possessor/person] + tiene + el pelo + [adjective] + y + [adverb + adjective]

For example:

• Tiene el pelo negro y corto.
• Tiene el pelo castaño y muy rizado.
• Tiene el pelo gris y bastante largo.

This is a very useful pattern for describing physical appearance in Spanish.