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Isolated vomiting episodes with aversion to eating in toddlers can be due to  
viral gastroenteritis, 
gastritis, or worm infestation commonly. 
You may try following measures:
1. Syp. Emeset or 
domperidone can be given for vomiting episodes.
2. Tablet Junior Lanzol can be dissolved in water and offered to the child for associated gastritis.
3. Give her rehydration therapy such as lemonade, Buttermilk, or ORS especially if she develops diarrhoea episodes.
4. Keep trying for feeds.
5. As it might be due to worm infestation, give her 
albendazole syrup. 200mg on 1st and 15th day at bedtime.
This should be helpful.
If still persistent vomiting, then do contact your 
pediatrician.
For further questions, do contact us.