Thanks for the info!
SW - the bit size is fine. I might try the homemade bitguards and see how that goes.
Kickshaw - The sores are in the corners of her lips... the place where the bit constantly touches, whether I have contact or not. You know the part that you are supposed to have one wrinkle if the bit is correctly fitted. Kinda hard to explain... but I think you get what I mean.
I've heard that some people use vaseline - anyone tried that?