I broke my elbow (radial head fracture) after college around the time I was training for a marathon. I had a huge brace on, and it is very difficult to run with an arm brace. You are off balance, can't go too fast without it banging against you, and it HURTS. I know it's a different injury, but it's not so easy to just stay in basketball shape. Especially sprinting...you use your arms a lot for momentum. Obviously there are other drills/exercises you can do, but I'm not so sure it's been easy to fit in with road trips, finals, etc.
That said, she is clearly not in the shape she was in the beginning of the season. Hopefully with regular practices and easier games she'll have the time and energy to do extra conditioning. I don't think there is anything wrong with observing that she has put on a few pounds, no one thinks any less of her.