Hi
Same sort of thing happened to me, I reversed over a daewoo matiz that stopped really close to my bottom after I had indicated to reverse into a parking space, and TBH I never noticed what with the kids in the car talking. I did feel a slight resistance as the NATO hitch ploughed a lovely furrow up to her windscreen.
She went mad, I just said I would sort it out, and exchanged details. I managed to get a bonnet off e-bay in the same colour for £30 so I thought I got away lightly, only for the couriers to turn it into a 50p coin. So I took all the dents out myself and got a mate to spray it. cost me just the paint. However in the meantime she phoned me to say her car will now no longer start and had left her stranded at work, I thought maybe I'd squashed the bonnet onto the battery, as after the bump, I did not want to open the bonnet as there would be no way it would close again. I had to go over to her work with a big pry bar, jump pack and a load of zip ties! only to discover she had left the interior light on. This happened twice, but on the second time my mate came with me for a laugh and we all got talking about the many other dents on her car, in the end she agreed to have them all fixed as a cash job, and seeing as we had the right paint, a days work banging and filling and another painting, we in the end made a profit, albeit not much!
She was really happy in the end, and now keeps ringing whenever her mates need car work doing, which can be a bit of a pain.
Really try and talk her into fixing it yourself, get a secondhand door, (find a part)? strip it yourself, back to the bare shell, repair any damage and get the paint code, and then try to find a friendly bodyshop who will do a cash job, in the lunch hour. Arrange to fit up door at a later date, ask for a mates help as you don't want to drop the door. take your time and be methodical it really is not difficult, be careful with fresh soft paint though.
Best of luck, don't let these swish body shops profit, they take all the insurance work and leave the little guys scratching for work.
Pete