As I've mentioned on other threads, I am not a fan of alfalfa, ESPECIALLY for a hot horse. Very high protein feeds mean more "hot energy". You want to find low protein and feed more of it-grass hay, beet pulp (you can feed up to 40% of your horses ration-it's cheaper than hay and a good source of calcium and fiber), rice bran for "cool" calories if you think she needs some fat. I feed a textured feed called Integrity Lite with no molasses for my hot horse, it's available in CA and is one of the few feeds that has no alfalfa or grain in it-it is beet pulp, rice bran, oat hay pellets, soy meal, wheat bran, etc. I like it, but it is just a supplemental feed, my boy only gets a few scoops a day. Mostly he gets hay (timothy and bermuda or orchard), and he's a hard keeper so he has to eat a lot of hay, 6-7 flakes a day. But he's also 17.2 hh and about 1400 lbs. Any feed that is around 12% protein or less is good, in my experience for a hot horse.