Does your sister know about this? You should definitely let her know. (And if this has happened before, she can tell you what she did about it.)
Is Reshi still having runny poops today? Is she acting funny in any other way?
If she hasn't eaten anything unusual, I think you should call a vet and ask for advice. Make sure you tell them the keet doesn't eat vegetables or fruit, and hasn't been in a shower or bath. Also that the keet is 9 years old.