I think she is dreaming , my son sometimes like this. He is three and a half month la....
When he cry , I will talking to him aside his bed.
If he cry serious , I will hold him on my arm until he stop cry and sleep again.
Agree, I do think she is dreaming, having a nightmare la. This may be caused by playing too much or seeing some new faces. I will carry & hug her, let her know she is taken care, then she will stop crying & sleep again.