And as you said, they aren't babies. So, tell us about her setup, because 95% of the time, it IS the setup, traffic, etc. It would be silly to refuse to give all of that info because you think it isn't important. It is the most important factor.
You see, if it ISN'T any of that, then she is probably sick, and you should take her to a veterinarian.
So why don't we rule all of that out first.