A little girl at the HIV group home looks out the front door to a sunny courtyard. Most of the children here don’t know they are HIV+. It’s too risky. Their teachers don’t know. Their neighbors definitely don’t know because if they did, they would have to move again. They’ve moved eight times in ten years, all 28 children. If their teachers knew, they would be isolated and discriminated against or even kicked out of their pricey private school — a…