It really irks me when other people don't respect a person's private property. She should keep her daycare business off your lawn.
I don't have much advice to give other than I feel your pain. Hope things get better for you in the near future.
That really sucks. Makes you wonder how people are so blind as to leave their kids with a loser who doesn't teach them any boundaries insofar as the neighbors propery is concerned. She's probably only too glad to get them out of her house and onto your lawn so she doesn't have to watch them much.
I say kill two ugly birds with one stone .. go outside in your underwear alot, make sure you look like hell. That should keep the kids off your lawn and tick off the bull dyke.