Unfortunately, there is not a good way to find the people who do this and most of the time they are not found as they mask their IP addresses.
Tell her to change her password XXXXX something very highly complicated and see if that helps.
Can you suggest how this occurs? (How can someone hijack an AOL address?) Is there someone at AOL I can talk to about this?
They basically hack into the account by figuring out the password XXXXX going through the IP Of the email account and sending it out directly. While aol and other providers try to avoid this from happening, unfortunately hackers are out there and there is probably not one person at aol that you can talk to although you can try to contact aol at(NNN) NNN-NNNN