I feel like one of the key reasons that she hasn't debuted/returned yet is that their would, like, be nothing for her to do. Yeah, it is frustrating to wait this long and is probably a bad booking decision, but look at where she got injured. It was at a time where she just returned to the main roster, and was doing stuff with Dana Brooke to begin. Now we haven't seen Dana in a while (except for being with Charlotte occasionally) and Charlotte/Sasha/Nia/Bayley got their own thing going on, so what would she do? She left while having Dana Brooke by her side, and that's it. Albeit, I hate what they're promoting her as..a playboy model? Seriously? (Thinking about it now that's probably an exaggeration, but you get my point.) This is 2017 for gosh sake.
I hope that when she returns that she'll adapt her persona that she had before she got injured, and go on a tear. I'd love to see a Bayley vs Emma feud, Charlotte vs Emma, and so on.