Is she a subject or object pronoun?

The Word 'she' is a subject pronoun. It is not difficult to work that out: just use the Word in a pair of simple sentences, once as a subject and once as an object, and see which sounds right.

'She loves David.'

'David loves she.'

The first sentence is right, the second is wrong. It would have to be 'David loves her.' 'Her' is the object pronoun.