DD (18mo) has been pretty good at bedtime until the last couple of weeks. She is cutting teeth (molars and at least one canine) and bedtimes have just gone to bits.
She gets up about 7.30, has a nap from about 1-2.15, goes to bed around 7. The last couple of weeks virtually every night has involved crying and then one of us going up to her and getting her up, calming her down and putting her back. She then goes off to sleep without any problem - usually, but it's often 8.30/9 by then, so she's not getting enough sleep. So we tried putting her down a bit later - but I think she is just overtired by 7.30.
We don't do the going in and leaving thing because it just makes her crosser. I'm assuming it will settle when the teeth finally arrive - once she's asleep she is fine