Joe,
Do you have any place that you could move your mailbox to that would put it away from your neighbors? Or suggest to her that if she doesn't like backing up, to stop short and get out of the vehicle and put the mail in. I know, the post office delivery people out here are the same. They don't want to get out of the vehicle at all. And by the size of some of these women I can understand why. That is why I have a post office box so I can avoid these delivery women.
Ron