How to know what the answer is? Training tips?

wow i have a horse that cribs too, he hates the collar it hurts hiom a lot. but he`s never done what urs has, she sounds like she might be a little buddie sower. and it probably was too tight. i would maybe work with her on staying away from the othe horses, we seperate our horses some times for a day or two and it seema to help, they learn that if there away from them for a wile that they will see them again soon. so good luck!!! =)