I am afraid she may have to decide which she loves more, barrel racing or the horse. Me, I always choose the horse, but then I just trail ride. I would rather change the discipline than sell one of my horses. But I know I get wayyy too attached and I know that other people see horses more as a sport/hobby, not as family members like I do.
I am not a conformation expert by any means, but even to someone that isn't, this horse obviously has long pasterns and is fine boned. Normally I don't pay much attention to pasterns(unless they are too upright), and my own mare (just a trail horse) has pasterns that slope more than I like, but wow, these ARE noticeably long even to someone who doesn't put too much emphasis on pastern length.
I personally think barrel racing is a hard sport on horse's legs anyway so it's something I would never compete in more than say, a fun day or puttzing around an arena with friends. But to each his own. I know a lot of people take it very seriously. To me, it's not worth ruining my horses legs. I always plan to keep them until they die of old age, and I want to be useful up until that point if possible.