I definitely agree with Ryle as well. Also, if you even suspect that your horse is colicking, don't feed him. It will make it worse. My horse just recently colicked. When I thought she was starting to feel better, I tried giving her some grain to see if she'd eat it (b/c she had been uninterested in food) which she did, but it only made her feel worse. Especially if its an impaction, the food will just build up.
I would definitely watch her, especially since she rolled. Watch for ANY signs of discomfort reappearing. If there is, get the vet out immediately. If she's still in pain, he needs to feel into her intestinal tract. As well, there is gastric colic, which is a build up of gas. All the signs you described sounded like colic. Colic is simply abdominal pain and sometimes it can be very mild. If she's feeling discomfort in her belly, its some form of colic.
Oh, and is she passing manure? If so, if its really dry, that is also a sign of colic. You want to see very soft manure.
Hope everything turns out okay. Not trying to scare you with this, just letting you know, because I just went through this last week, and colic can be very serious.