Danielle-- now that she's a few weeks out from radiation, she should start that slow but wonderful upward turn (sounds like she already has)... I know I did, though I took a nice dip at one point afterward before coming back up... Nuitrition is very important -- some of my big problems came from being dehydrated and not getting enough good calories in me...
I'm now two months out from IMRT and I feel tons better... I'm even working about 30-35 hours a week and eating a diet of "real" food most meals (even taco salad the other night, without many chips however)... Like Minnie, I crave my carbonated beverages, but they still burn too much... That's probably a blessing as I drank way too many of them before and wonder if all the sugar and poor nuitrition contributed to my condition in the first place -- that's for another thread, though...
Keep up the good work as her caregiver... You and others like you (my wonderful wife!!) are true gems for walking through this with us...