3 year old wakes up at 4 am everyday now - help!!!!

Ever since she’s gotten her big girl bed she’s woken up at 4 am everyday and it’s been about a month now. I’m exhausted - I just want to sleep. What can I get her to do to stay in her bed and go back to her normal schedule? She used to have a schedule of 8pm-8am and now it’s like 9-10pm to 4am. She also has an hour nap during the day. We’ve tried cutting her nap but that didn’t work…should I try the cry it out method? I hate doing that but I’m soooo tired. 😅 when we were sleep training her when she was a baby the cry it out method worked, but is there a point where babies/kids are too old for that?