Does it happen when she is in front or will she just got go under or around em? Did she EVER have any confidence?

Find a slow dog that you know wont fight/get in her way but is simply slow and give her a few hit outs with it. Even give plenty up the straight. Aka find a dog as slow as half of my team lol, i have done that ive got a few slow ones here who are my pilot trainers for pups etc.

Whats her nature like outside of on the track, is she lacking confidence there? If so start the process there. I take all mine to a local school at 3pm when the bell rings, the amount of young kids who come crashing over thinking WOW a racing dog is unreal, certainly gets the spookiness out as they get used to sudden movements as kids are all over the shop.

If she is fast then she is worth the effort - Thats why we in the dogs.

China doesnt pay top dollar for dogs unless they are top range so unless you flog her off for a couple of $k to them, she probably wouldnt be worth the effort trying them unless you are in the know. Ive found this via experience.

Good Luck with her. Hope she gets going for u.