I think it's a common thing at this age. Could also be molars or a combination of the two.
My honest advice is just go with whatever works best so you can get some sleep - try the chiro or whatever too, by all means, but just bring her to bed with you if that makes it easier. Once this passes (and it will pass) she'll go back to her own room again. Maybe you can convince her to snuggle up next to you, rather than on top of you. I just kept shoving DS off till he got the message.