Mike, I would ask you if Rider's the kind of person who'd shamelessly take advantage of a comatose hostage, but I already know the answer is yes.
Actually, no, because Rider does have morals (look back at the stuff that happened with her and Angra, for example), but she is the kind of person who would
gladly torture an amoral vampire who tried to kill them all.
Remember she has no idea what went on here. She just thinks Gabriel captured some enemy vampire that was trying to kill them. If she knows the truth then she won't hurt the girl unless she
has to, because she would feel sympathetic towards her.