Any rabbit hit by a car will 100% need to see a vet. In the meantime, keep the rabbit comfortable in a box, with some towels. Also put some grass or some type of lettuce (anything but iceberg) to nibble in there with her. Make sure the rabbit cannot jump out of the box. Bring it to a vet tomorrow and let them do a check-up. Also, now is a good time to start researching a rehab facility near you who may be able to care for the rabbit after the vet makes a diagnosis.