Hi, I understand your concern. Vomiting and loose motions in a 3 1/2 old kid is referring acute gastroenteritis. Virus is the most common cause. If it was controlled and then started again, then, further diagnostic tests recommended to determine the right diagnosis: - stool examination - stool culture - abdominal ultrasound - complete blood count - urine analysis For the moment, I advise to: - keep her well hydrated - if still vomiting, should send to ER as iv fluid replacement treatment should be carried out - give probiotics to stabilize intestinal flora - tasectan or pepto bismol can help with loose stool Wish fast recovery.