Are you honestly expecting people to not use their gardens because you are in yours?
And you think it's not unreasonable? How odd !!
And to be fair, if you're there reading a book, how is she to know you're out? Do you think everyone goes upstairs and checks the neighbours back gardens before going out to hang washing? Or have breakfast? Or even paint the fence?
So you have a small overlooked garden, so do many!
My garden is quite large and we have 2 neighbours each side (attached and not) and 2 neighbours to the back of our garden, plus the neighbours attached to each side of those back houses. I guess they can see our garden as we can see some of theirs.
Does that stop me hanging out washing every day? Or potting plants or having a smoke? Or my 6 yr old playing out?
No and if anyone dared to complain in the middle of the day that I was doing something it would be comical!
No one gives a shit what you're doing in your garden, no one cares if you hang out washing when they're eating breakfast, no one chooses to sit outside for a bagel or toast thinking "oh how unreasonable of sue next door to enter her garden when we are CLEARLY eating breakfast right now"
Shocking !!