I know it's not the idea situation and I'm not 100% sure as I've never had this happen before either but if she's quiet in the bedroom all alone and content I'd leave her up there and just quietly check on her every 15min or so....

I wouldn't moe her into the main living "open" space for another 2-3 days....if this is what she likes then so be it. I know it's odd but.....each kid is different.

re: keeping the others awake.....well it's going to be a hell of a week so stock up on your coffee, advil and wine for later on tonight. LOL

(hugs)