Re: Serious problem with DD. Need help :(
I would talk to a doctor. The fact that she is unresponsive to you could mean she is sleep walking. It could also be a sleep seizure and confusion/disorientation upon waking. (Not trying to scare you.) I've also seen diabetics who act like that. Is she better after nursing/eating/drinking at night? A doctor can get her into do a sleep study to figure out what is going on AND if there is a medical cause.
It might be nothing but the reassurance that it is just a stage/night terrors might help you and your family thought this difficult time. It's worth it to call and get her checked.