Since my DD was a few months old she has had the same bedtime routine. Bath, pj's, story and bed. She's 2.5 now and it's always worked.
We have just been away for 2 weeks and pretty much kept the routine and she slept excellent as always. Now we are back it's like her routine is totally alien to her. She gets out if bed, scream until purple in the face. Making up reasons why I should go to her ( I'm sick, I have a snotty nose, I need you, in sorry etc).
We're following the advice if taking her back to bed without interacting with her, but she is persistent. It's taken an hour tonight. It's the 3 rd night so hoping it gets better really soon.