I actually FINALLY got into contact with main headquarters at Feed-Rite and the guy was SUPER helpful - unfortunately, they're actually battling a blaze in one of their hoppers right now that's wiped out their stock (just my luck), but they carry virtually everything I need.
He's advising a product called Mega Bran that's designed as a high-fat supplement. They don't have rice bran pellets, but they DO have rice brain oil. However I am leery about any liquids as people are dumb and it's -40 here
Here's the website, have a gander and let me know what products you think may be suitable!
Empower - rice bran pellets. W O N D E R F you L stuff.
I've actually been told that, in general, rice bran is an American product, not a Canadian one. The guy at Feed-Rite essentially told me they carry products with rice bran IN the product, but I'm probably SOL for finding any actual rice bran based feeds/pellets. I called five other feed stores and they had no idea what I was talking about.
M 30 is suppose to be some good stuff.. I dont' use it but have tlaked to several that have and do and they LOVE it ... the only people I know that have went "off" of it has been because they moved or could no longer get it for some reason
I would suggest talking to your vet to see what you need. Have you had the vet out to see if there is an underlying problem to her weight, or lack of? This year during the spring Jesse had lost about 100 lbs so we had the vet out to see if there was a health issue or he was just at the bottom of the pecking order (he's always been an easy keeper).
It ended up being that he was just on the bottom of the totem pole. So she gave him a viatamin shot and suggested to start feeding him Senior feed (our hay quality is bad also). Now he's almost completely back to his good weight.
I don't know if you can get it over there but Baileys number one is the est thing ever for weight gain, perticularly if she needs quite a bit of weight on her or has a delicate tummy. We have a little rescue pony on the yard who colics when fed, he has been starved pretty much from birth, to the point where he is so malnourished that he has lost the sight in one eye and his growth is severely stunted, He is now on this stuff, putting on weight like there is no tomorrow and hasnt coliced once. No.1 Cooked Cereal Meal