1st week nursery- hyperactive 1yr old won't sleep. Help!

[gg45]

Hi

Our 13month old is in her first week at nursery. She has slept soundly from 7pm from 7am since 14 weeks old (not exaggerating) - unless ill.
Suddenly this week she is up yelling her head off when we try out her to bed. Last night she wanted to party from 11pm to 3am- yelling like anything if we tried putting her to bed/leaving her and then a happy little lamb immediately if we let her out to play with toys. Tonight she just WILL not go to sleep.

I guess she is overstimulated (I notice her lunch nap at nursery has been a tad shorter than usual).

Please might I have some recommendations for how to solve this?! Feels like it could quickly spiral!

We had to do a lot of early bedtimes in the first month or so of nursery to combat the overtiredness and over stimulation. We wouldn't get her back out her cot unless we need to change a nappy etc and rode it out. She did quickly get used to the change in routine and was sleeping well again soon (although its brutal at the time).