I just got up in the pitch dark and stepped on hermit crab! Her entire leg broke off! Is she in pain?

Hermit Crab! I looked down, and she was tucked back in her shell, but her leg was totally broken off and laying beside her. The entire leg. I am stunned, embarrassed and ashamed. It must have gotten severed from the it sticking out and force from the shell coming down on her leg with my weight. I am feeling wigged out. I put her in her cage, on a fresh water pool and sealed up the crack I had for extra air. She is in a 20 gallon hexagon tank with two bigger hermit crabs. There's a lid, but there is an air space. Is she feeling pain and what can I do to help? By the time I read these responses, a day would've passed already so please advice me according to that time frame. Thank you and God Bless you and the poor innocent girl Crab. Her name is Charger. It may be a boy...I don't know!