I like Joanna since she is one of the very few serious WMMA fighters.
I think that even if she gets the belt back she will lose it shortly though. Eventually someone will find her chin and she doesn't seem to react well to that anymore.
Since even when she outmatches opponents and 10-8 them multiple rounds she has a hard time finishing, there will be plenty of time to land on her. Though not many of the women, especially lower weight ones, hit hard.
I think she should be favored against almost everyone, but during like a 5 fight run she is bound to get hit pretty hard eventually. Unless she keeps only fighting the ones with hilarious stand up(not impossible).