The impression I got about Cara's riding is that she heads out frequently on the trail alone. This mare seems to be pretty herd bound and lacks self confidence alone which a lot of horses do. In that case, it's important the horse is really attached to you as another member of the herd and confident in your abilities as herd leader.
Whenever I start training a horse I basically have it follow another one and that makes the young horse comfortable with the whole absorption of what's going on. I'm not sure any amount of groundwork is going to make that mare what Cara wants.
IMO, if she really wants to make it work she needs to ride with someone else for a while. After many rides she needs to have that person leave them and Cara and Lucy walk back by themselves. She has to be willing to hop off and walk next to Lucy if she becomes frantic or whatever and keep working on whoa, even walking next to her. That's what I do anyway. I use a lot of voice commands. None of the big trainers do but it works for me. If she had someone start riding with her, Lucy would act a lot better (I think) then if they disappeared at different points Lucy would gain some confidence on her own.
Whenever I start training a horse I basically have it follow another one and that makes the young horse comfortable with the whole absorption of what's going on. I'm not sure any amount of groundwork is going to make that mare what Cara wants.
IMO, if she really wants to make it work she needs to ride with someone else for a while. After many rides she needs to have that person leave them and Cara and Lucy walk back by themselves. She has to be willing to hop off and walk next to Lucy if she becomes frantic or whatever and keep working on whoa, even walking next to her. That's what I do anyway. I use a lot of voice commands. None of the big trainers do but it works for me. If she had someone start riding with her, Lucy would act a lot better (I think) then if they disappeared at different points Lucy would gain some confidence on her own.