My first thought was maybe she got pinched or poked by something in the crib.... This morning, did you do a thorough check of her crib, just to make sure nothing is poking her or pinching her and that there are gaps where she got a foot or hand caught?
However, I think that when babies start dreaming, or being conscious of it, as their brains are getting overloaded with info/stumuli, their dreams can really scare them, and it could just be that she was associating the dream-scariness with the crib.
Is she teething? Sometimes teething pain or pain from ear infections gets worse at night.
I will say that once they get used to sleeping one way (like having you hold her or sooth her to sleep), they want it that way every time.... and it can be very hard to break (and you may have to "break the habit" a couple of times.... we're dealing with right now, again, with our 2yo--he was sick a couple of weeks ago and I got him at 1:30, with a temp and the poor thing was miserable for a day.... but after that one night of me getting him when he woke up in the night, he wanted it every night after that, even when he was better, and I had to do some "tough love" (Ferber CIO method) and it was awful...... but at least we're all not sleep deprived, which is healthier for all of us in the long run. But I made good and sure he was 100% healthy before I tried that, and I wouldn't hesitate to get him if I thought he was sick.
Anyway, long story short, I would say, check the crib, and have her checked out or at least call the pediatrician if you have concerns.... A friend's toddler never had a fever when he had earaches/ear infections, but would cry at night (the moving of the infected fluid in the ear shifting can cause a lot of pain, and lying horizontally during sleep will allow it to shift like that but it doesn't usually happen right away). He had no other symptoms of ear infection, though, other than night crying.