June 6, 1969 and never came back.Since then, her daughter Linda Chapman has never given up hope that she will find her mum.Detectives investigating her disappearance have now released a special computer generated image to show how Isabella might look today.They hope it will bring them new leads in the case and will finally give Linda and her brothers Stephen and Richard the answers they so desperately need.“I just want to know, one way or another,” Linda says.“I don’t feel like I can sit on