Idk, I think the change in her mood and her change in appearance are two separate things.
IMO Brandy looks beautiful, the Christmas run was about as good as it gets. She simply took her veneers out and gained some weight. That's it! She doesn't look bad at all, and I personally prefer the natural teeth because she looks like debut Brandy.
Brandy has had some mental struggles but I don't think that's the problem. She had seizures (don't know the cause) and that's the reason for the measured speech. I'm sure she is on medications to prevent more which likely gives her the sleepy look.
Overall I believe she's fine, it's just likely a new normal. For her and us. She likely took the teeth out because of the seizures, because sometimes people bite their tongue & cheeks. If she spoke about it, I believe she would get grace from the GP. If not, people are going to make everything dramatic.