They won't be interested. It was a damage only collision with both parties details exchanged at scene. All your legal obligations have been met.
When Police report an accident, their role is not to apportion blame, but to try and establish what happened. Those details are then requested by insurance companies, who have their own assessors and will look at the facts and then establish balme (if any) from there.
In your case, just fill out your form, submit your pictures, and let your insurance company decide who is to balme. That is what you pay them for. If it is a stone bonker non fault on your part, then your company will play hardball with theirs. You will, in the meantime, have to pay your excess, it's in your terms & conditions, but if blame is apportioned to the other party then you will at some point get your excess back.
Could take years though if she isn't having it.