***** NOT A TEACHER *****
Hello, C. Miles:
1. If you are taking a test or writing an official report, I agree that you should follow the rule: use SHE.
2. But if you are a young person and, especially, a male, I suggest that you speak as do most Americans (young and old) in ordinary conversation: use HER.
3. In fact, probably most Americans would not even use the subjunctive: "If I was her, I certainly would not lend James $100."
4. There are rules and then there is real life situations in which we have to get along with other human beings.
a. I am sure that you have seen (American-style) football players on television.
i. I have NO DOUBT that if a tough, masculine American football player were to say, "If I were she, I certainly would not lend James $100," he would not be on that team for long!
James