If your 13-month-old daughter has vomited four times since 5pm and her last wet diaper was at 2pm, you should focus on ensuring she stays hydrated. You can increase the frequency of breastfeeds or offer more liquids if she is not breastfed. Pedialyte™ can also be used to help with dehydration. Keep an eye on her urine output and if she shows signs of severe dehydration, it is best to seek medical advice. Otherwise, she should start feeling better in a couple of days.