KayKay,
There is always the horse that does not follow the rules.(not that any of mine do either)
, but I have never had one of mine be that relaxed and then foal, but if your horse has runny stools and milk,plus is engorged. I would think tonight too, but she just seems much too relaxed.
If she foals, it may not be till early morning.
All of mine this year were oh so nice and foaled before midnight. Most by 9:00PM.
(wish I could train them like that for every foaling year) So far I have had 10 live foals and only one more to go. Watch this last one keep me up all night.
Good luck with your foaling and I hope that you are able to get some sleep.