By Vassia Barba A mum of four and her three-year-old twin girls tragically lost their lives in a horrifying car crash just as they were leaving their nursery. Schoolmates and staff gathered outside the Right Choice Child Development Centre in Rock Hill, South Carolina, to mourn the loss of twins Mariah and Mackenzie Hughes, as well as their mother, 30-year-old Tionese Hughes. The driver of the other vehicle involved in the collision, 39-year-old Kristen Agard, also perished in the accident last Friday evening. According to investigators, Kristen’s vehicle crossed the centre line of Saluda Road…