Well, I doubt you were "hacked"; more likely someone guessed your password. So, cracked, yes; hacked, most likely not.
Still, as it's already been said, if she doesn't believe you, that's her problem and frankly she's not worth your time.
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Signature credited to Nathan (or whatever he decides to call himself next)MSN address: yamiken (at) hotmail (dot) co (dot) uk
[size=6](You know the drill, remove the spaces, replace the at with @ and the dot