My 4 years old cousin eats only rice, chocolate and ice cream she never eats anything else and her mom doesn't see a problem in it so is this nutrition dangerous and what can it cause on the girl(note she isn't obese she is actually getting thinner)?

Were the mom in my practice state law would require I report her for neglect. She would face court supervision to change or have the kid removed from her care. Yes such a diet is inadequate for normal growth and development & if it continues the child will be in trouble.

It is not healthy that she is losing weight. Pediatric supplements include a variety of protein shakes, smoothies with nut butters is there are no nut allergies. Offer a variety of fruits, vegetables and lean protein sources, in addition to dairy products.