Children should have a positive relationship with food and nutrition, that's why it's important to introduce them to vegetables early on so that they would get used to it. Slowly introduce your niece to vegetables that children are more likely to eat (eggplants, corn, tomatoes) while trying to hold off on giving them bitter and sharp (ampalaya, arugula, okra).
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You can try mixing the chicken with other vegetables although make sure that the vegetables aren't that bitter yet. Probaby try mashed potatoes first with gravy then ease her in to carrots, singkamas, etc.