when she bolts, how far do you think she would go if you didnt do anything ? I have some experience with OTTB mares [not saying they are all the same though !]. And I have found that if they are feeling nervous and then bolt, and you trap them [by pulling back on the reins] it can lead to them being more nervous. If you are experienced enough/ comfortable enough, I would try to not interfere when she bolts and she what she does after 10-12 strides, she might find that she has no reason to run because she's not trapped. If she starts bucking like crazy, you need to interfere !
I helped one major bolter in this fashion, she would literally bolt 10-15 times every time her owner rode her, because her owner got so tense and clamped down on her. Bolted a total of twice with me over a 6mo period. I stopped working with her, and a couple years later her owner ended up euthanizing her because she started bolting again. Wish she had told me, as the horse was fine, it was the owner =[
Gypsy & Scout <3Everybody is a genius. But if you judge a fish by its ability to climb a tree it will live its whole life believing that it is stupid. ~Albert Einstein