Maybe what Diaz was referencing was that the team is not exactly chanting: https://youtu.be/YH65jS-EseQ
Isabella shortened the quote "the belief level is low" making it read like team may be on the verge of shutting it down, no confidence in themselves or the coaching or all the above and I don't think that is the case at all.
After the start to the season with the success they experienced and now to be 2-7 in conference I would expect them to be down. If they weren't, I would be concerned about their commitment to winning.
Still time to recover but they need to get the train back on the tracks and soon. A series win and better yet a sweep this weekend would improve things greatly.