Questions & Answers about Mi hija tiene el pelo rizado y tarda poco en peinarse.
Because with body parts and things closely connected to a person, Spanish often uses the definite article (el, la, los, las) where English uses a possessive like my, your, her.
So Mi hija tiene el pelo rizado is the natural way to say My daughter has curly hair.
Using su pelo is possible, but it usually sounds more emphatic, contrastive, or less idiomatic in a simple sentence like this.
- Natural: Mi hija tiene el pelo rizado
- Possible, but less neutral: Mi hija tiene su pelo rizado
In short: Spanish often prefers the hair where English prefers her hair.