I'd look for the omega horseshine. It will definitely not hurt her, will make her shiny for sure and contains apart from the flax also yeast, omega 3 fatty acids and several minerals and vitamins. The maker is Omega Fields, they can most likely tell you where to get it. It's around 45$ but lasts a good 3 months. Like I said above, I'm very pleased with it, I noticed a difference in appearance after 3 days.
Grains...there are tons out there

I used nutrena life design senior for adding weight and Purina strategy for keeping it on. You can also use straight grains, but watch out for oats, TB's have a tendency to go crazy on oats. Been there, done that, got the T-shirt
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