Hello, OP here! So you FMLers know, my wallet now goes in safe places when I use the bathroom( ie. My purse or backpack.) I was actually in the process of reaching down to pick it up when her hand appeared in my stall, from under the door. I didn't step on her hand, but thought about it. I did yell at her and report her to management, though. She has actually stolen other people's wallets, so I guess I am lucky.