How to make a hard keeper gain weight?

Hi!
I have a 17 year old Standardbred mare who will just NOT gain weight. She has been on Trimax, beet pulp, and oats as well as unlimited GREEN hay for over a month, and isn't gaining anything. Maybe I'm doing something wrong? Any recommendations would be greatly appreciated.
I was also thinking of doing a liver/kidney flush/probiotic. Any reviews on those? I have owned my mare for 3 years and she has always been a hard keeper because she was badly abused and neglected when I got her to the point her entire spine and backbone were exposed. It's so sad to see her in this condition. HELP!

See oats never worked with my TB. She never would gain weight as long as I had oats in het ration. Eventually switched her up to coop working horse( comparable to Hoffman's) Masterfeeds finishing touch and free choice round bale along with being blanketed the whole winter, she finally started to look less like a starved beast. She also had an unlimited access to salt and mineral block.

Some people have really good luck with adding canola oil to the ration. Personally I never had to resort to that, but if you do it slowly it is supposed to work well
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First, I would have her teeth floated if you havnt yet. Next- and before you go and blow all that money on probiotics etc (personally I think it is generally a waste of money, I really havnt seen any results) FLUSH her with like 2 different kinds of wormers (reason for using 2 is so you kill any kind of worm that might be in her- different wormers have different chemicals that kill different things)
If you havnt done either of those yet that should help A LOT
Next I would suggest adding CANOLA oil to her feed (not corn, flax, rice, etc. canola oil has the most calories per cup of ANY oil and it is one of the only ones with BOTH omega 3 and 6 fatty acids. It is also one of the cheapist) we just take a measuring cup (to regulate but I supose you can just pore it from the bottle) and pour it over the feed. One cup has almost 2000calories.
Next I always recomend the purina omaline- the mare and foal. YES- it says mare and foal. But my guy recomended this to me. it is a 16%. it is great because it has a LOT of protien and calories, but does not make them high or excitable etc like oats or alfalfa may... it also helps build muscles because of the protien. My old horse was on a scoop of the purina omaline and a scoop of beetpulp (and we went through the majpority of a gallon of oil when I first got him) and he went from a dull coat and thin and kind of "back yard looking" to putting on at least 100lbs, got some good muscle definition, a beautiful glossy coat, etc... over a period of the 6 weeks I officially owned him (long story short, he was killed. But when he died he looked the best he had in years im sure) but it has also worked for my best friends 21yo ex-racehorse. With all the horses I have suggested this regiment to or had on it they have all had obvious improvement.
Hope it helps!

Thank you so much guys!

Do you guys have any reviews on the feed called, Cadence Ultra by Buckeye? My newly adopted Standardbred is on this at the stable she is currently at until they bring her to my house.

I use Nutrena Boost supplement in Topaz's feed and it has helped him a lot.

Deworm for tape worm.

I have a gelding that came to me emaciated, you can see his before and afters in my photos. Anyway, teeth float, worming, then lots of fat! Beet pulp, alfalfa, oil and free choice hay. I no longer do the oil but would in a heart beat if I thought he needed it again. I did replace the oil with purina amplify which is a supplement that has 30% fat. Hope this helps. Good luck.

It can be done and it does not take forever. I think these pictures were 4 months apart tops. And I think he is heaver now, lol.

The color of the hay does not indicate it's nutritional value. You can have GREEN hay that is basically worthless.

Have a fecal done. Before you go dumping all sorts of de-wormer down her, you need to know what type she NEEDS if any at all.

My hard keeper gets beet pulp, unlimited grass hay, alfalfa, Strategy and a vitamin/mineral/probiotic supplement. He's actually a tad fat ATM.