Stomach Ache post Covid. The solution?

My 5 year kid got COVID a month back. She vomited, had fever around 102 for 1 day. The pediatrician gave levoofloxin, vomikind, spasorix, ibrufen medicines for 5 days. After that she is completely okay except for stomach ache and farting issues. She is on very simple home cooked food since then. She has been given cefixime, benezyme, enterogermina, junior lanzol and lately rantac for stomach ache by pediatrician. Also given Bandy one dose and another to be given after 15 days. Somedays she still gets pain and a lot of farting. She feels too full with little intake of food. She is energetic and playful and no other complains. She pees normally, sleeps well. But for instance today she is farting abnormally more. What could be the reason? What will be the solution?