Wait, Sana, the way you're saying it you're implying that it is external kinetic force acting on the body in tandem with its natural movement, which is what I thought we were not doing. A great deal of anaerobic respiration will start to cause tissue damage if done too much, and it may kill cells naturally, but there will not be TOO much long term natural damage.

Also, speeding up digestion would not fit with the "magical adrenaline" idea, but it would be a good thing to pick up. She may be able to do it subconsciously as a variation on the same spell, and not realize the difference despite there being one.