The stuck shed would be a priority for me as well, & oddly enough, I've helped plenty of snakes with sheds (over many years) & they always seem to understand -somehow- that I'm helping them.
They don't appreciate me butting in initially, but once they realize their shed is coming off, they get more cooperative. I actually find the process helps to build some trust. It must be weird to be a "pet snake"- with wild instincts & pesky people in their faces so often. Since the cat-attack was clearly not the snake's fault, if I were this snake's human, I'd be feeling responsible for allowing it happen, & making every effort to put everything right with the snake. They didn't ask to be captive- so it's up to us to meet their needs, even when it's challenging.
But again, you have to re-acquaint them with being touched in a friendly manner, don't just make a dive for their tail tip!![]()