S.O.
I just have to say that I totally disagree with "locking" her in her room. What if she needs to go to the bathroom or something or there's some sort of emergency? That's horrible! She may just need a little more TLC. Have ya'll gone through any changes lately? Even the tiniest little change can effect a little one of her age. Do you think that there's something she's afraid of? Have you talked to her about why she doesn't want to sleep in her bed? I think the idea someone mentioned about a sleeping bag in her room. If she'll go for that, try it out. I find that keeping a good routine with my son helps tremondously with bed time. Things like this are usually a phase and will soon pass. Good luck!