The prednisone will definitely help with her allergies and make her more thirsty. Unfortunately one of the side effects of it iswater retention. So there is a possibility that Mollie Rose will look a little bigger. But this will go away (without any permanent effects) once the prednisone is stopped. So keep her on it (and reduce your kitty boogies ).

A couple of weeks ago Emily woke me up in the morning by sneezing on me ... and you are right there is nothing quite like kitty boogies (especially first thing in the morning).