Join Date: Jun 2011
Location: Northern Ontario
A rumbly belly is usually a good sign. Although I do remember my vet telling me that increased gut sounds can sometimes be a sign of spasmodic or gas colic.
IMO, I feel like colic isn't the issue here, unless it's very very mild. I say this because it seems like it's been going on for an extended period which is what leads me to think ulcers could be the issue. But you can't be sure unless you get the vet out. I second the comment about her possibly coming into heat. My mare doesn't like having her stomach or hips touched when she's in heat, and usually nothing bothers her.
Also, some horses just have those "spots" they don't like having touched. I doubt this is your issue either because it's only recently become a problem, but I've had my gelding for almost 8 years and he's NEVER liked having his flank area or belly brushed or touched. He pins his ears, lifts his hind legs up, bobs his head, etc. I don't even curry the area. The vet said it could have been from being whipped in that spot when he was on the track or his skin is just very sensitive. He's perfectly healthy otherwise.