Nup, she's ruined! I will take her off you for $600!
If this mare is 4yo she looks very well developed. And your aunt owned her a few years ago, so presumably when she was a yearling, before she was raced? And she's become OT by 4yo, which means she wasn't good at running, or she broke down. So, assuming she didn't break down, that's good! Means there hasn't been THAT much racing done, so less body damage likely, compared to a horse who raced till 8yo or such.
I too think she looks nice, but for the sake of objectivity, the not-so-nice things I see are that she appears a little 'sickle hocked', with hind feet at a low angle(she may have quite low heels there). This is common to race horses especially, and may well be a body issue, not 'conformation'. A chiropractic vet could give you a better idea & whether it's treatable. She has a shortish looking back for a TB. She is narrow in the front end, a little base narrow. Again, this may be a body issue, not 'conformation'. I've learned from a very well regarded veterinary chiro that it is common for horses to have rib damage & be a bit 'bound up' from the birthing process even, but it's apparently pretty easily fixed in young horses. I won't comment on foreleg/hoof balance, with that angle pic & that she may be standing on a lump or some such.