Your doing it! Be strong and consistent.
Make sure she's had her evening snack or late dinner and then you won't have to worry about responding to that because you know she's had something. If she knows she won't be able to get a snack after bedtime, she will eat it at the appropriate snack or dinner time, which is earlier. Yeah, can't do anything about the potty yet.
Your doing great and I swear you'll eventually get 8 hours of sleep again yourself in a few years or decade.
Good Luck and Do what's right for you.