Provided your car is legal and sensibly parked (which it seemed to be) your neighbour has no real justification to put notes on your car. Any average driver can negotiate parked cars when driving, so what's her problem.
I had this when we moved to our house ten years ago. The road is a public road on an estate and no one has a parking space. However, all the neighbours have 'their' parking spot outside their house. When we moved in I parked outside the house two doors along - and found a note on the windscreen asking me not to park in their space! I nearly knocked on the door but I'm pleased I didn't as we know them now and have got along fine ever since. Indeed, if I come back to find someone has parked in 'my space' I feel a little peeved. It's the same inherent possessive and territorial instinct of humans that leads to murders, most wars etc.
I think you were properly parked granny from what you say. I think your neighbour's showing that same possessive instinct. It's just a matter of keeping them happy so that everyone gets along.