Vomitings after 20 hours of chemotherapy

My mother has stage IV colorectal cancer. She underwent her 8th chemotherapy session which completed on 21st July 2022 at 8 pm. That day she had dinner also, and breakfast too (bread butter) the next day. She was given an injection (Peg-ly) in her stomach after 12 hours of chemo completion. After that she was feeling very weak and nauseous. She ate a bit of rice and curd, and vomited after few hours. She ate 4-5 spoons of khichdi in dinner and vomited again in night. Then in the late night she vomited, and also passed stools 5 times since last night. The tablet Ondesteron was given to her while she did vomiting in night. Again she is feeling nauseous. Also, her sugar levels are very high around 226. What should be done ? Please help. What should be given to her that stays in her stomach.