You were near the legal altitude of 400', this is either :
Over the top hysteria on the neighbors part, heck the kid must need a life too, developing into a real snowflake that one if a drone scares him
(Most young boys would want to get real close to such a great 'toy'.)
.
Or, it could possibly have been another person operating over her property, and much lower.
So, the question begs . . . were you over her home at / just before the time she roughly took to drive over to your place ?
I agree don't show here photos from the drone in general regarding this, but if you had to show the HOA some to let them see just how little you can see from above, then do it in a general way, and NOT HER HOUSE !!
It's probably better to show them some sunset / landscape type photography if you ever need to dispel any privacy fears.