I think that you should talk to her directly in order to find out if there is any truth to what you have heard. I recommend that you don't talk about her to other people or you will be just as bad as she is. Gossip isn't good. Also to be on the safe side, I think that you should change your e-mail passwords.
When there is smoke, there is usually fire. If you find out that she is a backstabber, drop her like a bad habit. You don't need that negativity in your life. Good luck!
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