No, but there is no evidence from her geneology that she has Impressive in her. We have considered that. So far the filly we got out of her shows no sign of this problem. I've waited awhile before breeding her again because of a fear it might be hereditary. The filly is 4 now. The mare was doing this way before that.
I got her when she just turned 3. I have heard since then that she had a very rough breaking in:( Treated pretty rough. I think some damage may have been done then, and now, maybe, scar tissue, bad alignment, etc. could be the problem. Even if we could find a logical reason for all of this, I don't think I'd ever feel safe on her again. Too many bad experiences. Altho for the amount of time I tried there wasn't that many times. She would go a year with no problems at times. Long enough for me to think we had the problem fixed, then wham, for no obvious reason there she'd go again.
After I gave up on her, my son tried roping on her. She did it more with him. Makes me wonder if the heavier saddle and rider were the cause.
I have 2 good horses now and she makes a great brood mare, so I at least still have her. When we bring her home to breed her, I always stand around staring at her, thinking, I wonder if she'd be OK now:). It's good we have pasture to send her too where I don't have to look at her too much. I'd probably keep trying, but I'm afraid that would be a mistake.
Becky
What a story. Everytime I think I've heard everything, here comes something else I hadn't heard. It does sound like seizures. Maybe in training she reared up and fell over backwards, hitting her head on something. At least she's a mare and you can use her for something else. If she was a gelding you'd probably have to make some hard decisions.
Off to the zoo!!