D.S.
Hi W.,
Sounds like she might be having nightmares. I have friend who's youngest was that way when she was a baby. I never thought babys could have nightmares but they do. Soothing her and letting her know she is ok might be the only way to calm her down at night. I would have to ask my friend how she dealt with it, I think she out grew it..
Good Luck
D.