1. 她的 (tā de): This is the most common way to say "she," but it means "her" and is used as a possessive pronoun.
Example: 她的书 (tā de shū) - Her book
2. 她 (tā): This is the pronoun for "she" and is used as the subject of a sentence.
Example: 她很漂亮 (tā hěn piàoliang) - She is very beautiful.
So, if you want to say "She is beautiful" in Mandarin, you would say: 她很漂亮 (tā hěn piàoliang).