Hi R. -
We coslept with our daughter until about 1 year, then transitioned uneasily to the crib (in our room) thinking that would make it smoother. It really didn't (it was like torturing her that we were so close but she couldn't snuggle with us). So we put the crib in her room and did a very wishy washy version of crying it out for a few days - this ended in frustration. After 3 days or so, I really stuck to it and let her cry until the crying escalated (not just regular crying - that would subside quickly when I came back - which was already breaking my heart, but she was really upset - actual tears, was not so fast to be consoled). Then I went in and reassured her - tenderly but to the point and as brief as possible. Saying something soothing, over and over like "mommy always comes back" worked well (also came in handy when we started pre-school). We had to repeat this many times this first night that we got "serious" but the next night was dramatically easier (not easy, mind you).
She did, however, quickly learn to save the urge to poop until we had left her for the night, knowing that we would have to come and pick her up to change her diaper. This made me realize how diabolically manipulative they can be at a very young age - give them credit for this. We love them and hate to see them upset and they KNOW IT.
If you really think she has sleep ANXIETY, then maybe you should consider a sleep specialist, but otherwise, though it seems surreal, it really is normal.
Some things you can try:
- MUSIC - a whole cd or one magical song on repeat(the first track of the "African Dreams" compilation was like tryptophan for my kiddo)
- SMELL - let her sleep with a t-shirt or pillow case that smells like you or you sleep with her crib sheet as a pillow case so it will smell like you
- BACKGROUND NOISE - white noise forces kids to try to shut it out and often puts them to sleep in the process (witness babies sleeping in noisy restaurants). And I've never tried this but I've heard of people using baby monitors in reverse - so they can hear you (washing dishes or talking after dinner or whatever) and be reassured that you are still close by.
- TALK HER THROUGH IT - "I'll be back in one minute...two minutes..." (this still works - my kid is 4 now) and really do what you say you will
- TENDER BUT FIRM (set this precedent now with sleep for you will need it again and again in many scenarios)
also, I agree that you should wait at least a year or so before transitioning to a big girl bed. It wouldn't be safe now, and I don't think it will accomplish what you want - being more exposed vs the cosiness of a crib might make her feel less snug and comforted rather than more comfortable.
sorry for the ramble...ULTIMATELY, you read, you listen to advice, you try different things (really give whatever you try a fair shot), and you decide what works best for your kid and your family.
good luck.