Ok, here's how I see it. So far Ms. Christie has "saved" Fred a couple of times (or at least rendered her medical aid and taken her to the hospital). It isn't inconsistent (as far as Fred is concerned) that Jane would now try and help the Chinese girl avoid being forcibly taken away, especially since they said they'd blow out her kneecaps. I understand Fred's conflicted about her father, but I do think it's possible for her to keep ahold of her denial about her father and still think these men were "bad." She simply has to think that these men acted without her father's knowledge (whether or not that's true, remains to be seen). I don't think she has to whole-heartedly trust Wu, but it seems pretty obvious that these guys weren't in the right. So, if she needs to question anything, it seems to make more sense she'd wonder why these guys weren't on the ranch and who else they seem to be working for.