Man, my buddy ran a muffler shop and had the same deal, started writing the customer's exact words like "rattles when I turn left by the school" and his comebacks dried up too. Funny how the weird stuff they say ends up being the clue you need.

My neighbor in Tucson did this to his patio last summer and it actually held for like five months. He used the chicken flavored ones though, which I think made the difference because they've got more oil in the seasoning. The worst part was the smell when it rained, smelled like a dorm room for two weeks straight. Now there's a family of crickets living in the crack because they like the crumbs.

Wet shoes on the porch every Sunday is already strange enough on its own, but the flashlight to her face takes it to a whole different level. You handled this with way more patience than most people would, giving it three weeks before setting up the camera. That backward walking thing is what really gets me, it sounds like she knew exactly where that camera was and wanted to make sure you saw her. I would check if that video captured anything else, like her stopping at the end of your driveway or looking back at the house. Nobody does that kind of thing by accident, and you are right to be worried. Keep that video saved somewhere safe, and maybe mention it to the local police just to have it on record if things escalate.