Just opinions, if you're feeling that itch to get her moving. AOL isn't looking like it'll go anywhere soon. They are doing the same marketing strategy just as google and nearly all the free email services are doing. In turn that ad revenue is worth something, until they lose that base, and AIM is an alternate feeder for that.
still daring and got the sparkle in ya? look into email forwarding. As far as I'm aware; gmail dominates the forwarding department. If Aol's allows email forwarding, gmail can take care of it from there and set it up so that she can reply back with her new address or under the guise of her old one.
Hotmail not sure if they let you mask the old address, but yahoo doesn't for sure.