Join Date: Aug 2009
Location: New South Wales, Australia
The mare was likely acting that way because of the stud's presence. However, I don't think the blame should be placed on the stud.
Where I live there used to be a stallion and the mares would throw themselves at him, they were obsessed with him sometimes, they'd squeal and kick out at each other and just be, well mares. People only focus on controlling a stallion when they think of a horse's hormones, but mares have them too. Ideally a horse should listen to a rider regardless of anything else, and that obviously wasn't the case. The rider didn't have control and the horse didn't respect her. To an extent a training issue, but also just a tough set of circumstances.
If it's something you regularly do I'd start taking the mare out with a rider who can control her until she learns her boundaries.