Do you have any evidence to support this?
Look it up.
I'll weigh in on this to agree that USUALLY suicide is not a result of poverty or hunger, but of some form of depression or ennui. Suicide rates are usually higher in prosperous places where the kids feel that life has no purpose. It's not necessarily medical, although it can be.
I suspect that what may have gotten to this girl was not hunger but the desire to be like the other children in school, who could pay a rupee for their lunch. Her mother fed her on table scraps brought from work, but that's not the same thing as eating rice with all the other kids. Maybe they teased her for being different. Indians can be very caste conscious.
That's purely a guess, of course.