Is A Diet With Oats, Barley, Semolina, Banana, And Chapati With Bottle Gourd Suitable For Severe Gastric Issues?

Hello sir My mom is 73 and having gastric problem since from many days and sometimes pain is really hard that made her cry. I am thinking to follow the below diet chart for her. Please tell me whether it is suitable for her or not morning simple oat, 11am cooked barley, 2pm suji, 4pm banana and 7pm chapati with bottle gourd