Izzy doesn't really know her own strength here. Which is probably a good thing in her case. The last time she tested what her prosthetics could do she ended up breaking her right leg. But she was incredibly sure that she had bionic powers like Samuel Ross, the Re-Engineered Man. But of course, she didn't. To be fair, she was 8 1/2. Having to get her leg fixed was bad enough, but she also lost a bet and had to give her chocolate milk to Louise Merkel for an entire month. Izzy was much more careful with her prosthetics after that. Except for that one time she fell out of a tree. 

When Izzy has some down time she will likely think about how much chocolate milk she could win off Louise Merkel now.