Why Is My Stomach Sticking Out Why Is This Happening To My Mom?

Why is this happening to my mom? - why is my stomach sticking out

My mother had a gastric bypass surgery five years ago. went well, and lost weight. But a few years ago, she can not eat without vomiting. She says it hurts and feels like it is stuck. if they throw almost every time you eat. It is sad, and I can say that she is in pain. She went to the doctor about a month ago and said that everything went well with your stomach and others. What could be causing this?
Thank you for your help.