According to your sister sign and symptom and report she is suffering from gastroenteritis .
She have infection around the gastrointestinal tract area so that she is showing value as low haemoglobin and low RBC and low platelet .
Next Steps
You should take consultation for best treatment.
Health Tips
Please follow good life style as take plenty of fluid and take less spicy and fatty foods and
keep positive attitude to fight any disease and any problem of your life.