your mare is really cute and I hope for the safest foaling for you! Do you know what/who she is bred to?
Your place sounds GREAT, we, too moved into a new property 2 years ago and we are still building, repairing/putting up fence etc...
Of our 21 acres, about 7 acres are fenced for the ponies (ours are a bit larger, smallest mature pony is double registered 37" at the withers, largest 1/2 shetland pony is about 13.1 or 2 and 14.1 hh arabian mare).
MMM really hit all the points - clear & concise - even if seeming a bit harsh (we've also had some serious reality checks regarding the ponies in the last two years - most not related to breeding/foaling).
We have been lucky. We have lost a couple of foals at birth - no hard foaling - but in both cases the foals' lungs weren't fully developed, were filled with material NOT considered to be from EHV1/4 (both were necropsied).
Lost one colt in utero - twisted cord. The mare delivered him fine, already dead about 6-8 weeks before due, in between checks, put on antibiotics but vet didn't feel she needed to be "flushed" (I wish we had though).
We lost one colt at 3 days of age - failure to thrive, dummy foal syndrome. We don't feel that the mare necessarily had a rough delivery, but hard to tell as she was/is one of our "wild ones" that we do very little handling of - safer and less stressful for everyone. She DID let us handle and milk her out while trying to help that first colt, until he died. Then she went back to her wild, striking, kicking, biting self. She was somewhat ok the first few hours after this years colt - now she has a halter/drag line on and we can safely draw her in/tie her up to handle her colt. They are doing FABULOUS this year and the colt is SUPER nice.
While breeding 1/2 and purebred Shetlands, we have never been RIGHT there when the mares foaled! Yet, I actually delivered more than 1/2 the foals we bred/raised at home as a youth and young adult (full size horses - about 1/3 the number of foals we've had since we started breeding ponies in 1995) AND have mid-wifed/delivered foals for other full size horse owners. Had a vet that would call me if they had a mare that foaled and they couldn't get the foal to nurse. She swore up/down that I was magic for those mares/foals - I have no idea how many total but I do know 5 the one year - getting the foals to stand/nurse and the mares to accept those foals.
I have had foals born in between me checking on them and 10 minutes later while I grabbed a piece of pizza in the kitchen next to the stall (she was in our dog kennel in the carport - cars parked outside. Cupid born 2010); one mare foaled while I was setting up feed in the feed area - while standing with her head in the feed bucket she'd just been fed in (Flashi born 2011). Had one mare that milk tested ready 6-12 hours. Again in the carport but it had been raining a lot and stall was water wet. I put the mare in the pretty much dry, round pen while I stripped the stall. She foaled on the sand before I had the stall ready (Echo born 2013). Also in 2013, had the same mare that had Flashi, deliver about mid-morning about 15 minutes after being turned out on grass - of course she chose the nastiest part of the pasture (no grass, where they went to manure). These were all Shetland mares from 38" to 43" in height - all experienced foalers.
Had an Arab mare in 2001. She was let out of the main pasture into the area in front of the tobacco barn we used for storage, to eat. While I was setting up feeds for the evening and putting bags of feed into the various feed containers, she "disappeared". One of the girls alerted me - the mare had gone down along the outside of the perimeter fence and into a thorny thicket, laid down and delivered her colt and was headed back to her feed tub while I went to move her colt. That one was a purebred Arab. He was born about 9 am. In 2000, she foaled a 1/2 shetland colt that was dropped in a snowbank about 2:30 pm while turned out, before we got back out to the pasture to feed. We trailered the pair two miles back to the main barn, where the mare was treated for a retained placenta. They stayed there a week while treating and we waited for the snow in NC to melt away... Same mare at a VET's barn in 2008 - bred to a purebed arab. Foaled on a non-bedded, sand floored stall while they were getting in a new load of shavings!! All of the foals Chaunter had were fine.