blaming you as a P plater is rubbish!!!
I hope you guys have insurance and let them battle it out.
however being behind the car - it wont look good
it is best to get her licence, name, rego, address and contact #
more info to the insurer the better for you
they may also request a visual description such as a drawing of the event.
I guess being a copper, she is trying to intimidate you, dont let her.