Some kind of joint supplement, and a probiotic for her digestion would be ideal. Unless you think she needs something else (like a hoof supplement). The probiotics will definitely help her digestion, she might gain a little bit of weight but nothing drastic.
I use this, it has H/A, glucosamine, chondroitin sulfate, and MSM. The 1 month supply is free shipping, which is nice. The bad thing is I can only find it online. Flex-Force with HA Corta-Flx (Equine - Horse Supplements - Joint - Powdered/Pellet)
And then for probiotics (when I used them) I used the Manna Pro Opti-zyme. If you use 1 oz a day, it lasts like two and a half months, and you can pretty much find it anywhere.
Opti-Zyme Manna Pro (Equine - Horse Supplements - Digestive - Probiotics)
I use this, it has H/A, glucosamine, chondroitin sulfate, and MSM. The 1 month supply is free shipping, which is nice. The bad thing is I can only find it online. Flex-Force with HA Corta-Flx (Equine - Horse Supplements - Joint - Powdered/Pellet)
And then for probiotics (when I used them) I used the Manna Pro Opti-zyme. If you use 1 oz a day, it lasts like two and a half months, and you can pretty much find it anywhere.
Opti-Zyme Manna Pro (Equine - Horse Supplements - Digestive - Probiotics)