Well, 3nanny6 thank you for the explanation- I’m sorry to say I’m still a bit uncertain however if it’s like a mini-drive then it’s obviously just hers and I too would look at some attractive pots (if you are able to treat her and she’s ok with that.
If the parking is more “along the mini estate road” but in front of her house (think streets of conventional terraces), I expect it’s not actually part of her tenancy- albeit annoying - and there may not be any “rights” over this space.
I think I’d find out just how much it bothers her, and if it doesn’t I’d just grit my teeth. If she is bothered I’d check with her landlord (if the tenancy agreement is unclear) before putting pots in - as you need to know 100% that it’s her space to use as she wishes.
Good luck. I can see whichever pertains it can be irritating!