Need suggestions for a very off mare. 12 to tb , Poor coat, lacklustre oily greasy, scouring, very spooky flighty, goiter, often gets abscesses in front hooves very poor hoof quality, brittle and weak . Lacking muscle, weight etc. Not in any work in full time paddock access, very grassy but have not had any soil etc assessments done. 10 other horses in same property with no feed in fat condition nice coats, nice hooves etc. Was previously being fed 2 kg bio mare, 250gm sunflower oil, kilo of chaff as mix, constant access to mineral block, two biscuits of hay. Nothing changed. Weight constantly fluctuates. Nerds teeth being done. Up to date with parasite control. Any suggestions that I could get a vet to check for ?