She's one lucky filly. Not every horse gets a second chance at a happier life. Hats off to you!!! And since she's your only horse, she will get all of your undivided love and attention! That's actually very important. If there's no pasture mate, she will need more of your time and attention.
Honestly I don't see anything that looks obviously deformed, but I'm not a vet by any means. You might as well go ahead and establish a good rapport with a local vet and get an official opinion. Good luck, and please do update us!