IThis sounds more more like an ileus than a blockage. But yes, blockages can occur in the first year post surgery. I had about 3 partial blockages and they all resovled on their own. She will learn to manage blockages but I will tell you the best thing to do is 1. stop eating until it passes, 2. drink plenty of fluids, and 3. walk to keep the motility action going.
Her first six weeks will be fraught with periods of ups and downs. Do not get discouraged, this is complex surgery with a long recovery. I encourage you to go to www.j-pouch.org where you will meet others. Whether she is having a permanent ostomy, a j-pouch or k-pouch she will find support on that site.