[Billy]

She is Jennifers pawn to keep her safe.

Jennifer has totally ruined Rebecca, and I know Bex has a mind of her own, but Jennifer has made Bex feel like shes taken her under her wing, and been accepted, this is the way Jen works. By doing this through Bex it wont be traced back to her, and knows Rebeccas popularity in the house is going down by the minute, think about it;
Jen started the whole spitgate or whatever.
Jen had the idea to put the mixture on Rex's bad, infact she wanted to do it on Rex so he would punch or try to punch Bex, to get him thrown out.

And I know thsi goes against everything Ive ever said about Jennifer, but it has just hit me what's going on.