So morgandawn is the same as morgan.dawn as is m.organ.dawn
So if you use the wrong gmail address to sign up for another service, you will never have control of the other service (Facebook, banks, etc)
Since this is not a hack, just someone who does not know how Google works I tried to send her a Facebook message to tell her she needs to create a new gmail account that does not use morgandawn and that she needs to change her Facebook email address to that new gmail address. Unfortunately, she does not accept Facebook messages from non-friends. But since I am being flooded with messages from her friends, I tracked down two who do have Facebook messaging enabled and asked them to have her contact me (at another email address). She probably wont be able to log into Facebook for a while. And luckily she has only used my email for Facebook (I think). I did make certain that my gmail recovery email is set to another address and that I have the appropriate gmail security.