Student or Learner
1) She said "I'll call you if I'm in London".
2) She said that she would call me if she was in London.
That should be correct. How about:
3) She said that she would call me if she IS in London.
4) She said that she WILL call me if she IS in London.
3 and 4 are also OK.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.