Certainly at this point it is a mental issue. How did it get to this point is the real question. My guess, her outside shot is not falling. Simple as that. Her strength, from what I had heard, was she could drain 15-20 footers. Force you to come out, and she would blow by you on a drive. She had a lot of ways to score. But if your shot from outside is not falling, you become more one dimensional. Also the closer to the basket she gets, the more physical the play gets, and she is not yet comfortable.
Another thing I see is that she needs to be "acclimated" to certain type of games, early. Specifically, the physical games. It is tough on Geno, because he has other options on the bench and the games are important, but I think she needs a longer leash. This is true of most freshman who have come in highly regarded. Not sure, but her game suffered once Bria returned and she was no longer a starter.
Finally, I am 100% confident she is a great player and will match and exceed our expectations. She just needs to realize it's only a game. Go out there and have some fun. Relax, let the game come to her. Hustle always and contribute in other ways.