Sure, lets share background. My first idea would be that while Elena would never join such a group she might approch members when times got tough for shelter and food in return for her "services". A good tie in might be that Wilt was one of the few that would help her without expecting or taking any "pay" from her. Therefore, while she might not trust him fully, she would be more willing to team up with him, knowing, at least deep down, that he is good.
If you have any ideas for a different tie in, or details to flesh this one out, I am all ears.