The most recent news I could find where JM makes a statement regarding her evidence is 2001 and by all accounts it suggests she is still haunted by what happened.
Sunday Mirror -
"Julie, now 36, said: "I thought this was long in the past. The last few weeks have been a nightmare. As far as I am concerned nothing has changed - I sincerely believe he is guilty. Do I stand by my original story? Yes, absolutely. I always assumed he would be in jail for life.
"And while I fully accept that new forensic techniques could throw new light on the case I still believe he is guilty. He has a right to appeal, that is the law. It is just very hard for me to accept.
"At this stage the appeal process is so sketchy that I have no idea what is going on."
A friend added: "It is somethingJulie has never really recovered from. Ultimately it was her evidence that put him behind bars and it is something she still has nightmares about. She still grieves for his family and wonders if she could have averted the murders by telling the police about his scheming beforehand