I had my response all worked out in my head when I read your thread title (having made assumptions based on our own situation), but upon reading the thread, I can see why your neighbour gets pants on a twist (although her behaviour is unacceptable, regardless).
My DD is loaded into a wheelchair bus every morning, and offloaded every afternoon. Our NDN's drive is blocked by the swing out safety arm on the bus for the time that it takes to load/unload DD and secure her wheelchair within the bus. We live on a "no exit" street, so while the bus is engaged with DD, if anyone needs to get in or out, they can't.
I know it is inconvenient - very much so. Because of this, at the beginning of every new school year, as soon as we know her bus schedule, DD and I bake biscuits and take a tin to every neighbour, and give them her bus schedule at the same time.
It is a peace offering, a personal little "apologies for the inconvenience" gift and the schedule so that the neighbours are inconvenienced as little as possible. You would be amazed how much it has improved the relations with the neighbours regarding the bus.
However, we also work with the bus companies to make sure that DD is already out of the house and ready to load as soon as the bus arrives, and that expected delays are minimised as much as is possible.
It is your responsibility as a parent to have the area in front of your house clear for the arrival of the bus, not the neighbour 2 doors over. It is the responsibility of the driver to ensure the safety of your child by parking in front of your house. This is why the SN service is engaged.
It is time to try and mend fences. Talk to the bus company and ask if there is something you can do to ensure the bus stops at yours, and not 2 houses over, remind them that, for your child's safety, travel to the bus is to be minimised, and request that the driver be mindful of where he/she stops.
Once all that is done, then go personally to your neighbour with a bottle of wine or tin of biscuits and explain what you are doing to fix it all, apologise for the inconvenience and thank her for her patience.
It is all you can do - it is not her problem in the first place.