If it were me I'd invest in some fire ants and make sure they found their way into her home. Better yet, if she happens to lounge around outside tanning...wave to her as the fire ants do their thing!
If thats too much for you, then try ignoring her. I deal with enough ignorant people throughout the day. The last thing I need is a neighbor high on their horse judging me. At least you know you can find support and take comnfort in knowing we know you are not lazy, but suffering from a terrible disease. With friends like your neighbor, who needs enemies!
One day there will be a cure, meanwhile we must do our best to carry on.