Re your back gate. Can you fix a bolt low down on the gate? Out of reach for anyone reaching over? You could tell her it's to stop burglars / make the garden safer from outside danger for your son. Then do the going out / blind shutting advised by others. A few wasted journeys and she may be more amenable to arranged visits.
Should the NHS charge for such things?
Expensive free range chicken was tasteless!
Thank you x