Baby sleeps all night (WIN!) but takes hours to get there...

[mynamechangemyrules]

Hi, so... baby #3 sleeps from bedtime until morning. This is new and unusual for me, older brothers never did. They are 7&5 and wake at night to wee etc and jump in my bed...
Anyway, the downside. Boys sleep in approx 15mins from me saying 'shh shh enough, be quiet, shut up' etc etc BUT baby girl has milk, lies down when the boys do all quietly quietly, gets a second wind, and just buggers about for aaaages....
tonight it was 1 and a half hours before she settled.
As I've never dealt with this before, I've always sat in with them- but I'm not sitting in for fecking hours.
If I leave her, she cries until she throws up dramatically across her room (I've done it twice and it was for less than 10 minutes and it was awful).

What to do???

Anyone? I am losing hours of my life

She sounds perfectly normal to me. Why not have her downstairs with you while she is tiring herself out, she'll end up cuddling and falling asleep, then you can take her upstairs. There are no rules about times for going to bed.

How old is she? Just put her to bed later. She probably doesn't want to go to bed at that time - no point in wasting your life in a darkened room. Watch telly and have a
cuddle until she's ready.

It sounds like she's not ready to go to sleep when you want her to be. Try putting her to sleep later.