Hi N.,
I am sorry you are struggling with this dilemma, she certainly is crawling out of the crib early!
First I would put a gate up in her room, so she is not roaming the house at night. Also, put a big pillow below the crib where she gets out. Then, per nanny 911, I would get up at night when she stirs but go in and firmly put her back in her crib. Calmly say, you need to stay in your crib and go to sleep until I come to get you, say night, night and leave. You may need to go in multiple times intermittently during the night the first few nights and repeat this over and over so she is clear there is NO other alternative.
The key is that she is not reinforced for getting out, it simply has no payoff for her. Hopefully, she will get the picture that she is to stay in her crib until you come to get her out. And then reinforce her by saying, I'm so proud of you for staying in your crib - even if it was only from 4-6am!! And please put up the gate so she is not roaming.
I can relate in that my son gave up his nap once he crawled out of the crib, he just wouldn't wind down unless he was trapped. We then took his crib apart, I kind of wish I'd just keep walking him back to his crib.
Ihope you get some sleep soon! My daughter is 2 1/2 but very short but a climber, I know this is just around the corner, so I can try out my own advice.
J. (mom of 3 kids)