Why don’t you offer to turf both sides if she pays for it and you’ll do the labour? Then you can chalk up a dividing white line and a mini footy field for a kickabout or proper team rivalry to solve disputes. First to 3 wins. Could you also squeeze in a little terrace?, so the other neighbours could back up their favourite team and shout drunken abuse and chants. The street could save all their pent up anger and bickering till say, saturdays at 3pm! Cos it’s a small pitch, just have smaller goals and use a tennis ball and 2 players aside.