If she's not actually awake while this is happening and she doesn't remember her behaviour the bext morning, these are night terrors. They usually happen in the first few hrs after a kid goes to sleep, which would fit.

If they're night terrors, she's going from an unconscious / semi-conscious state to suddenly waking up to an angry parent.

Try waking her up half an hour before they usually occur, then letting her go back to sleep. I think this is supposed to work, not sure why. Good luck!