Jessica Wiggins convicted of allowing baby death 19 November 2014 Last updated at 17:38 A mother has been found guilty of allowing the death of her 12-week-old daughter. Isabella Vallance died of a head injury in December 2012 at the family home in Stanley Close, Redditch. Her father Tyler Vallance, 21, admitted killing her earlier this year. At the time, the court heard she had suffered nine broken ribs in two attacks. Jessica Wiggins, 20, of Heathfield Road, Redditch, was convicted after a trial at Worcester Crown Court. Callous individual Both Wiggins and Vallance are due to be sentenced on 18 December. The jury was told Isabella died at Birmingham Children's Hospital. A post-mortem examination revealed she had head injuries and fractures to her ribs and legs. The court heard these injuries had been suffered at the hands of her father, who had assaulted her on more than one occasion. Wiggins and Vallance, who lived together in Redditch following the birth of their child, had been having problems with their relationship. In July, Wiggins was acquitted of a charge of child cruelty, but the jury failed to reach a verdict on a separate count of allowing the death of her child, prompting a retrial. A month earlier, Vallance pleaded guilty to manslaughter and inflicting grievous bodily harm with intent. Speaking after the latest verdict, Det Ch Insp Jon Marsden of West Mercia Police said: "The death of any young child is a tragedy and Isabella Vallance had lived for just 86 days. She should have had a full life ahead of her but that was taken away by her father, a callous individual who could not control his emotions or his temper. As parents they were in a position of trust and care but sadly they did not live up to their responsibilities.