Maybe she is pregnant, with twins!
Seriously though, I hope everything turns out to be fine. Try to put it into the back of your mind for the weekend, since you can't do anything about it.
FWIW, my uncle had a brain tumor in hit pututiary (sp?). They had to go in between the sections of his brain to remove it. It messed with his body pretty bad. It came back, so they went in again, and got it all this time. Hes a different man now. He used to be 6'1" 220#. Now hes 6'1" and over 300! His body isn't controlled as well as it used to be, his temp will change dramatically, so will his diet.
I wish you both the best of luck.