Forget about AOL ... Unless you kept your coin at an online exchange, old emails will not help you find your lost coins. You might find an address, but what you need it your private key. Your best bet it to find the computer or hard drive you use to do the mining. Search the entire harddrive for wallet.dat files. If you find old harddrives, USB thumbs, CDRs you may have burned backups on, stick them in your computer, search the entire drive for wallet.dat files.
I also wondered whether where OP had kept her BTC, if it's an old exchange or wallet it could've been gone for good. I guess backing up your wallet offline really works just in case you have kept even a small amount of BTC today, who knows what it's worth in the future. Recently more and more people are looking for their old wallets or hard drive to recover their long-lost BTC. If she has saved her credential on her e-mail, I guess the only thing she can do to recover it is to ask for AOL's support to recover her e-mails. But it seems it will be tedious work if she's referring to numbers of e-mail, or computer she has too check. I hope something positive will come up on your way recovering your e-mails.