How do you specify 她 in speech?
By context. Originally there were no gender specific pronouns, but 他 was used for he, she and it.

Western languages influenced Chinese in this regard, although Chinese have earlier also had a rather complex system of honorific pronouns (like 朕).

A feminist discussion in the Western world of today concerns the default usage of "he" and related prnouns (and similar in other languages), which is said to "discriminate" women. But essentially, "he" is just the neutral pronoun, just like 他, whereas "she" and 她 are later linguistic extensions to denote sex or gender.

In essence, the Chinese have managed to describe gender/sexus by context since ancient times, without resorting to auxiliary pronouns.

In practice, you could say 她那个女人, or 美丽的她 and similar construtcs to emphasize sex.