Yes, you are probably right, it is probably a case of accidental parenting, we all do it from time to time don't we? She got used to checking that you are still around at 4 in the morning and once she has seen you happily goes back to sleep...have you tried wake to sleep to break the habit of waking up fully at the same time every night? Does she scream or just chat? My ds is 22 months and spends ages talking to himself in his cot, I think there are just so many new milestones at this age, there are so many new skills to learn and so frustrating for them. He sometimes wakes up in a real bad mood, but if he agrees to sit on the potty for a wee he usually feels much better once he has remembered why he is so uncomfortable. When that doesn't work the last resort is to pop him infront of the tv for five minutes, just as a distraction from the screaming- always works, but possibly through accidental parenting!