Hi my 12 year old has the stomach flu for a week now and is okay but still has diarrhoea and she still has stomach pain and can't eat any solutions?

Beware of dehydratio. Initially, the most important thing is to avoid dehydration. Watch for urine production, presence of tears and moisture of the mouth, as well as signs of decreased activity or lethargy. Administer oral rehydration fluids, then progress to bland diet If no improvement, seek medical attention.