where abouts is this woman/horse based and where are they planning on up-rooting to? There are people who specialise in the rehabilitation of horses with either injuries or behavioural issues. I have been doing this for ten years now and find that most behavioural issues are actually owner issues and most injury rehabilitation situations arise or come to a head because people can't afford the genuine solution and therefor look for alternative cheaper options. Having said that....i've dealt with some very interesting issues.
There sounds like there are two big problems here, one is that there is a horse that needs care that this woman isn't in a postion to give because if she can't handle is with 100% confidence then she can not cope with rehabitating an injury like this.
Secondly, if the horse were sound, its still a bad owner-horse relationship because they are not well matcheddue to her nervous attitude/lack of experience and his young bolshy attitude.
Selling a horse like this isn'tan option, he will either end up in another very unsuitable home due to the fact that he would have to be sold cheap, or he will end up at auction an likely go for meat for pennies.
A suitable alternative is either this lady pays someone who has the experience and facilities to work with anf rehabilitate a horse like this or she could speak to world horse welfare and ask for them to help find him a suitable home. Their centers are all very full at the moment so whilst they would be unlikely to actually take the horse they will certainly help her to find an appropriate caring home for him. The people who work for WHW, certainly in scotland, are really nice approachable people who will completely understand the situation the woman has come into, they won't critisise her for doing her best, and will be very helpfull.