I would sleep with her. This isn't a kid that cannot put her self to sleep, you has been doing that. This is a child who is feeling insecure or unsure because of all the changes and she needs a little extra support.
My kids have done this off and on for awhile. I will let them sleep with me in my bed, or my husband sleeps with them in their room. (I am a really bad sleeper, if I am not in my bed, I don't sleep. Sleepless mommy isn't good for anyone, so this is how it works in our house.) A week or two of sleeping together, less as they get older, and then they go back to their routine.
My 10 year old just slept with me the night before she had surgery for the first time. Nothing serious but she was nervious so she went to bed in my bed with me. When my husband came up to bed we moved her to her room, and that was the end of it. She sleeps real well so moving her isn't a problem. My son who is five cannot be moved or he wakes up.
Anyway, I would give the little girl the comfort she needs and let her sleep with me for awhile. That's me. There are lot of people who don't like this idea, but it works for my family.
You may also want to take her to the pediatrician to see if there is anything wrong.
Lastly, you might want to talk to her about what the problem is, Is she scared? Did someone a daycare tell her something scaring?
That might help too. Good Luck.