Some are independent at a very young age. To make a decision as to whether an animal needs help you have to know what is normal for the species. The mother generally doesn't go far from the fawn. She returns to it only a few times a day to allow it to nurse. At other times she remains hidden nearby.
Rabbits make a shallow nest for their young.
The mother covers them with some of her fur and dry leaves. She only returns a few times a day, usually at down and dusk to feed them. The young are born blind, naked, and helpless. In 2 weeks, on the rich mild the mother produces, they reach the size of a small lemon, their eyes open, and they are fully covered with fur. By 4 weeks, at the size of an orange, they are on their own, and mother is preparing for a new litter.