If it was all on her computer, they have any right to view anything sent from that computer, any logs of her conversations.
Ever notice a work computer with PCAnywhere? They could view any & everything you do on a work computer! And if she left her AOL info on the computer, that's her problem!

Is she blonde?
Also depending on what state she worked in. Like if it was California, you can fire or quit with NO notice or reason! What state did she work in?
jDoG