You say she parks half on the pavement. In many areas this is totally illegal - and even where not so, may prevent people with prams, or in mobility pavement vehicles having free access along there. Report this parking to local authority.
Do you have a vehicle yourself? If so assume you park in your own drive. Without having to be nasty would be worth ringing their bell, welcome them to area, ( give some flowers, etc), and then request that they do NOT park their vehicle in front of your house in future.
Not worth getting into dispute about though. At my last house, which was at the end of a small Close, one of the first things I did was to pay out for dropped curb and paved front, so my car would be off the road. My neighbour at the very end, with a very large front garden area, always refused to have even part of that made for their car and reverse parked their car in the very centre of the curved area. This made it extremely difficult for anyone trying to turn their vehicles at the end of this cu-de-sac, and for me in reversing my car off my drive. On several occasions, my visitors would park in 'his' spot when he was not there, but half on the pavement, leaving the road area clear. He never took the hint, and when asked by other other neighbours to park like that told them that he understood it could damage a car to park half on, half off pavements. Was not worth falling out about though.