Bed Problem

We have a new sleeping problem here at our house and it involves Paige. Up until now she has been a really good sleeper. She slept well when she was a baby and started sleeping through the night fairly soon. I love that about her! Since she has turned "2" she isn't doing as well. One day I thought maybe she was big enough to sleep in a bed instead of a crib. So I changed her crib into a toddler bed and she played on it all day. When it came to nighttime, she would not stay in it. So I waited until she fell asleep and then put her in the bed. A few hours later I heard her bedroom door open (this is about midnight) and in she walks and climbs into our bed. Being the person that I am (and Matt as well) we let her sleep there. Both waking up with aches and pains. We don't want that to happen again. I was thinking it would take 3 nights for her to get used to the new situation. Well after the 2nd night being like the first I gave up and put the rail back on the crib and she slept in the crib the entire night the 3rd night. So maybe she isn't ready for a bed. Well that was about 3 weeks ago. She has slept good since, almost all night every night and I think that is great. Well a few days ago, in the middle of the night I once again heard her door open and wondered what was going on. In she walks and climbs into our bed. That little stinker climbed out of her crib!!!! How did she do that? Matt and I were both in shock! The next day during the day I was in her room and put her in the crib and said, "show me how you get out." She proceeded to throw her leg over the rail and then pull her other leg over until she touched the mattress from the other side. Then she dropped the last foot onto the ground. I couldn't believe it!! She can get out with hurting herself and she isn't afraid to do it in the pitch black of the night. So what do I do about this?? I DO NOT like her in our bed, we just got Parker out of there for Pete's sake, I DO NOT want another kid in there during the night. How do I get her to stay in there all night and not climb out? Anyone, please help!