What more could happen?!

Some of you guys may know that I just moved my mare back to the old barn I used to board her at. Except I pasture board her now, instead of keeping her up at the barn with a stall and just paddocks.

Well I had her hauled last night to the pasture at about 9 pm, there was already one gelding and about 6 other mares down there. All the horses looked fine from what I could see in the dark, they all came running up to the gate excited like they normally do. So I put my mare in, and they all took turns and sniffed/touched noses for a second before eating grass. (BTW they all already know each other. I wouldn't have just thrown her in there if she never met them before) Then I left for the night. I was on call the next day at the stable at 3 pm anyway. So I was going to check on her first before I went to work. FYI the pasture is about a mile down the road from the stable.

Anyway when I got there today at 2, I caught Athena, brushed her a little bit, and made sure she was alright because I worry like that. Then I looked at the other horses and noticed some blood on the belgian mare's tail. So I caught her, and tied her up to take a look. She had a serious vertical cut on her vulva that I could tell right away needed stitches. So I grabbed all my brushes, let Athena go, and walked Isabelle (belgian mare) back to the barn.

As soon as I got there, I put her on the cross ties and called the vet out and told the manager about it. While I waited I washed her off a little bit. Vet got there while I was bringing the other mares up from the pasture. Turns out she needed many stitches, and that she was also cut 2 inches inside past her vulva. All of us thought this was weird including the vet, but figured maybe she had some freak accident with a branch or stick maybe itching her butt where she shouldn't have? Because Isabelle makes all the other horses look like wimps, she's queen of the pasture. So we highly doubted another horse would've kicked her. Still possible, but doubtful. So we left her in the indoor arena for the night, and went down to the pasture to check for anything the could have cut her. Found nothing.

Now only my mare and the one gelding have full pasture board, so they're the only ones who stay there 24/7.
Earlier this evening, the manager of the barn texted me saying that the owner of the barn (and the belgian mare) is suspicious, and was having the cops drive by the pasture a few times turning the night because she thinks that someone purposely did this to Isabelle. NOW I'm worried. My mare is so trusting, she'll walk up to anybody. Isabelle is actually a horse who's known to be hard to catch at times! And it doesn't help that the pasture is literally in the middle of a neighborhood. Ugh, I'm probably not going to sleep tonight. -.-

I wouldn't work yourself up too much. Short of camping out there isn't much you can do besides notifying the authorities. Is there a reason she thinks someone has done this to her mare? It sounds a lot more likely she had an innocent and painful encounter with a butt scratching branch.

Well the owner of the stable and pasture isn't well liked by some of the people in the township that the stable/pasture is located at. Even though the stable has been there for 80 some odd years, some of the people who live there don't like the horses and are VERY mean about it. I've had tons of people yell/curse at me for riding on the road, which is part of the original horse trail, and they can't really do anything about it except complain. They have tried to sue the owner multiple times over this, and it never goes anywhere because the horses are allowed on the road as long as we carry pooper scoopers. Which we do.
Anyway, I really do hope the mare just lost a battle to some branch out there...

I'd like to say I've never heard of something like this before, but I have.

It's possible you either have a very, very sick person (yes, that's what I mean) OR someone was trying to make sure the mare wouldn't breed.

Chances are, though, it was some sort of accident, hopefully.