11th April 2011. A student who knocked down and killed a grandmother as she read a text message while driving arrived at court today to hear her sentence clutching her mobile. Keisha Wall, 20, carried the device into Reading Crown Court before she was jailed for two and a half years for causing the death of 63-year-old Christine Lyon in Reading in February last year. Wall was sitting alongside her mother - a driving instructor - when she lost control of the Suzuki Jimny that she was driving home from a shopping trip. Wall, who had only passed her driving test months earlier, was looking at the message on her phone when she mounted a pavement. Mrs Lyon, from Maidenhead, was crushed and killed instantly, a judge was told today. Wall was last month convicted of causing death by dangerous driving at Reading Crown Court.