is it really a problem for **you**? or are you getting pressure from others saying she "should" be falling asleep in her own bed, by herself? here's the thing, if it isn't a problem for you, then no one else gets a vote.
my son at 2 (he's now 3) was just ending his nursing career, was very attached to my hair, and still **needed** a lot of help going to sleep. and that was how we looked at it. he needed that help. he needed to know that sleep was a good thing, not a scary thing. learning to fall asleep and stay asleep in their own bed is a big deal and can be scary to little people. we take it for granted, but we shouldn't. we simply don't remember when we learned how to sleep on our own, in the dark.
i could not ever let him cry it out. and i absolutely do not believe it is necessary to the life or learning of a child.
when nate was 2, i would nurse him, then i would lay in bed with him for 30-45 mintues so that he could play with my hair while he fell asleep. (this left me wiped out.) often i would leave before he was fully asleep. eventually, we brought in "the hair" (a lock of my hair that i had cut off months before) and slipped it to him in the dark while he was playing with my hair. after a few nights of that he took it without question. it has basically replaced me. after that we worked on weaning, which wasn't terrible to accomplish for us. he still goes to sleep with the hair.
if she is in a toddler bed or a twin bed, i wouldn't suggest going back to the crib. that could be a giant step backwards and confusing for her.
have you tried finding her a lovey? that's basically what the hair is for nate. some kids will take to a stuffed animal, some take to a favorite toy. the idea is to give them something they can love to help them fall asleep. eventually, they will only need the trigger of the lovey and the dark to fall asleep. nate has a managerie of animals that he sleeps with; some of them travel with us when we go somewhere. even in the car. again, they are lovey's they help him feel secure enough to fall asleep without a fuss. sometimes they are even the only reason he'll nap. "your kitty is really tired and wants to take a nap with you. 'won't you please take a nap with me nate?'" he associates them with sleep, but also with comfort. it might be worth a try. i know girls tend to love all kinds of animals and dolls, but this one should be a special one. she can help you pick it out. (make sure to get two in case one gets lost or destroyed. just put the other one away somewhere.) talk to her about the purpose of the lovey. tell her that she'll be going to sleep in her own bed with her new lovey. you can agree to stay in her room for a little while as she settles down, just so she knows you'll be there if she needs you. but gradually make that time, less and less.
it might also help to establish a bedtime routine. our routine is: jammies, mama says goodnight and i love you, storytime with papa, fishy time with papa (he has a fish tank that they lay in the dark and watch), quiet time with papa (where they can talk about the day and resolve any hanging thoughts or feelings), then papa says goodnight and i love you, and then he's out of the room. nate falls asleep by himself, in his own room. he has a nightlight, which has always been there more for us than for him. we do it all in his room, in his bed.
ultimately, it has to work for your family. like i said, if the way she is falling asleep now doesn't bother you, then it shouldn't bother anyone else. they don't get a vote. no one got a vote as to how long i laid in bed with nate to help him fall asleep when he was little. no one got a vote when he slept with us until he was nearly two. it absolutely has to be ok with only you.
good luck.