True but couldn't she tell the GM's that shes been locked out of the house so can't get to her room to leave the FC? The GM's should be able to see their FC settings and see if it is true that their leader has locked everyone out and made it impossible to leave and get to their own private rooms. Maybe it won't prove the whole 'selling character etc' but it will prove that he's forcing people to stay in the FC, which could be possibly viewed as hurting player progression/harassment..?
@OP sorry this is happening, and I hope SE replies to you soon and helps. That's very rude for someone to do to other players. :(
