vs
QUICK ANSWER
"Of his" is a phrase which is often translated as "suyo", and "her" is an adjective which is often translated as "su". Learn more about the difference between "of his" and "her" below.
of his()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. de su
I have heard of his movies, but I haven't seen any.He oído hablar de sus películas, pero no he visto ninguna.
her()
An adjective is a word that describes a noun (e.g., the big dog).
1. (possessive)
a. su
Her children are very bright.Sus hijos son muy inteligentes.
I cannot stand her attitude any longer.Ya no puedo soportar más su actitud.
A pronoun is a word that stands in for a noun (e.g., she).
2. (personal)