You literally transmute matter at will, you do not need to fight Killcannon just turn his robot arm into cheese or something. Your nemesis is a villain that you do not need to consider the whole cannot effect living tissue thing for even a second. That is all.
What she really needs to do is go get an engineering degree so she can start building stuff properly. I knew the second that park went up something was going to go wrong, there is a reason we have building codes!