What type of condition is she in? What was the previous owner feeding and how much? If she is in good health and eating and drinking well, then I would stick with what you are doing. My geldings are on 1 1/2 scoops of steamed crimpped oats twice a day and alphalfa twice a day too.....my recsue mare is on nutrena safe choice and neutrena vitality....she does not like hay so I am about to start her on beet pulp for fiber, and alphalfa pellets. She also gets vita plus(just a multivitiman) and electrolites(once a week). So if you can up load pics then we all can get a better idea. Good luck. Keep us posted!!!