Belle may not be feeling well as you say. But the main problem I see is people expected Belle to go right back to the way she was before. And because she isn't acting like before she must have the wrong housemates or be in the wrong apartment. So RLC must have screwed up because there's no reason for Pixie Belle to not act the same as before. Right?
I said Belle had changed at the end of her first stay and I stand by that. Even though others said I didn't know what I was talking about. Now it's not likely but could be that a little of that has carried over to this time. Or maybe she has changed a little in the 3 months between visits. It can happen you know. I would find it more likely she just needs time to adjust and get to know her housemates.
So I guess the question would be is Belle the same as she was before or has she changed? Only time will answer that question.
And I know people to have patience is a waste of time.