My horse looks pregant?

-My horse IS NOT pregant, but she looks so fat that you could say she could be giving birth to twins! She was very skinny where I first got her, but i let her be filled out too much. She was on Stratagey (sp?) to gain weight, but now I give her a little less than 1/4 a scoop of Safe choice twice a day, so shes not getting much. I use to put her in an enclosed area with a run in for 15hrs a day so she wont founder, and not really any grass, but we moved her to my barn and I dont have that. I am going to start putting her up every night, and the grazing muzzle for a couple of hours each day. I usually ride her every other day, because it's been so hot, and it's hard to get outside at the coolest parts of the day. But now I am going to push myself and ride her everyday. Anything else i should be doing to drop her weight? Any ideas would be great, thanks!Keep slowly dropping her feed, and when you ride trot, trot, trot. My gelding gets fat pretty easily, and at one point I wasn't riding often and he had fat pockets on his shoulders. I reduced his grain bit by bit and rode him for about an hour a day every other day and did lots of trotting, up hills and around obstacles. He muscled up pretty quick after that.Start by decreasing the amount of feed she gets but not a lot at a time just slowly take out a little at a time. Get her off any kind of weight builder. And start to exercise her everyday you don't have to ride her though you can always lunge but when it is really hot still ride but not as much and don't work her as hard. Make sure on those hot days that you spray her down and keep her out of the sun.
you need to exercise her more, if not riding, you can lunge her, and you need to cut down her grain intake. don't give her nothing all at once...just cut it down little by little. also, i find that jumping helps gain muscle, but don't jump too much or too high or else the horse will develop joint problems. don't get lazy!
She hasnt gone in to heat in a while and she has been near studs unattended, before my cousin brought her home. If she was, she would be about 7 months. What do you guys think.