User blog comment:SATOSHISUMI/Mystery Woman/@comment-112.205.30.63-20120925100501/@comment-5426684-20120925102003

Sounds plausible, in a sense, I mean I still doubt its Lucy's mother since due to Jellal's reaction, unless he knew her mom which is unlikely. But anyways, I think its not that likely, but its still possible, since crazier discoveries have been made (Which conviently, Naruto Shippuuden portrays as Toby's identity revealed really pleased theorists and surprised the doubters). So anything can happen.