Recovery takes time and what she's experiencing is normal. Hopefully her surgeon went over what to expect post op. It can take weeks for things to settle. Everyone heals at different rates. Some folks it's fast and others it takes longer. Things will calm down but it takes time. She should be eating simple low residue foods for now until things improve. And frequent small meals I found were better than larger ones.
My surgeon didn't want me taking Imodium until two weeks after my surgery. (They worry about blockages) Just be careful how many she's taking a day.