ok I do get what you guys are saying so I should check to see if what i'm giving her is low fat?
Certainly if you don't want her to put on more weight, don't add fat to her diet, but it's low *carbs* - ie sugars/starch that is more important to keep in mind. That will effect her negatively - particularly her feet, regardless of her nutrition & weight. I know, you're probably confused & suffering 'information overload' at the moment
There's just so much to learn & much recent research into digestion & diet has caused us to rethink much conventional 'wisdom' about the subject. That's another reason why I highly recommend a service such as FeedXL.com to take some of the confusion out of it & explain the whys & wherefores behind contradictions of opinions, etc.
Also this is very confusing because all I really know is she already gets hay almost ever day like snack hay and an hour of grass right now. They just started putting them on grass.
?? Not sure if I get what you mean there, but it sounds like she's kept in a bare paddock or stable & not given free choice hay?? If so, this needs to be changed. Horses have evolved for eating low grade(compared to 'improved pastures) forage in small amounts, near constantly. It's very unhealthy for them to go hungry for long/regular periods & not get enough roughage/fibre. A few full hay nets around the paddock or one in her stable is the easiest option generally. If she's stabled & only gets out for an hr a day, this is also not good for her. Horses need free movement & the more exercise the better, so 24/7 paddock with run in shelter is best, but if that can't be done, as little time locked up as possible and extra exercise as much as you can manage to break up the hrs she's stabled is important for her health, not to mention wellbeing.
I did daily give her a grain/weight imbalencement everyday once a day
Again, horses have evolved for tiny & near constant feeds, and especially when feeding something like grain, which is not the best, or easy for them to digest anyway, it's particularly important to feed little & often - 3 small meals daily is the minimum you should aim for if feeding high-carb rations. She likely put on weight despite this feeding, rather than because of it.
If feeding grain or high-carb feed occasionally just as a treat, keep it to a handful or 2 max, as that amounts not likely to effect her negatively. Oats are about the safest grain to feed horses.
It's a steep learning curve, when you're new to all this, isn't it?? Hoof care is another huge subject that it pays to do your own research on, rather than just following people's advice. Cracked feet for eg. Is generally due to incorrect &/or infrequent trimming. I'm a hcp & there are others here that are knowledgeable on the subject, so you can post hoof pix if you would like any advice & opinions on that from us.