From what you write, the facility would not be responsible: an employer is not liable for damage to its employee's car unless the employer were at fault in causing the damage, and similarly a business which owns or rents property is not responsible for damage to vehicles on its property unless it is somehow at fault. But if a resident damaged the car, the employer/business would not be at fault--it did not cause or contribute to the damage. Your girlfriend could try suing the resident for the money; she would be liable as the person who negligently (carelessly) caused the damage.