Someone had similar case and he said, on the trial date, you show up in court, the cop show up in court and the lady you rearended doesnot showup, case is dismissed.
I think it's a very good chance that the lady won't show since you admitted your fault and she got her car fixed without deductible.
In normal traffic ticket fight case, i would request disclosure, but in this scenerio disclosure may tip off the cop to instruct the lady to be in court, therefore i say just show up at trial and check if either the lady or cop is not there, don't take any bargain from the crown, just sit back and wait till you are called, no lady as witness, they will dimiss the case. However plan ahead for any surprise, for example if they still want to proceed with trial you then call the lady as witness, no witness, no case.
In the case the lady and the cop both show up, find a good reason to adjourn the case, and again the chance for one of them not present at the next trial is very good.
just found another thread for u to check out (see Bookm post
http://www.ontariohighwaytrafficact.com/topic579.html