There is a reason for the distinction between residential and commercial zoning. The law is fine.
Cancer doesn't change anything. If she needs money then get a permit for a fund raiser. It sucks she has cancer, but her neighbors are not required to bear that burden, nor are laws exempt. Being terminally ill does not elevate you above others.
Shoot the neighbor that reported it!? That's fucking moronic. Maybe they have cancer too and the sales make it a pain in the ass to get to their doctor appointments. They have rights too, and your rights can't just be walked on any time someone gets sick. Stop thinking with your eratic emotions.
“Many that live deserve death. And some that die deserve life. Can you give it to them? Then do not be too eager to deal out death in judgement. For even the very wise cannot see all ends.” - Tolkien
You seem to think that a person with an illness has the right to impede on other's rights, when in fact, they do not. No one owes her sympathy nor charity and no one has to surrender their own rights to support her quality of life.
If the local community feels there is a problem with that law then they can bring it up and get it changed. Perhapse they could create a permit for the termially ill who need to sell their belongings. (she could also just use craigs list or ebay).
But the whole, "Poow wady is swick so she can do whatewer she wants, all da big bwad pweople upholding those laws are mweanies" is utter bullshit. Symapthy is no excuse for stepping on the rights of others.
Maybe I should get cancer so I can break laws and earn sympathy from it.
The decent thing to do is grin and bear it. This is a matter of human decency, community, being a real neighbor; this isn't about rights or laws.
There's often a difference between what's legal and what is right.
So the person who filed the complain was aware she had cancer? Did she have "Cancer Yard Sale" signs up so everyone was informed?
My "real neighbors" are some ghettos ass motherfuckers who fight in the hallways. Do I owe them sympathy? Should I grin and bear it when they bump music in an apartment complex because they might be sick and drum beats are thereputic?
Do you assume every yard sale you see in your neighbor hood is to benefit the terminally ill?
I think the decent thing to do is for her to follow the laws and not annoy the shit of out of her neighbors every week. How's that for decency?
Either way, to me the neighbor comes across as an asshole, to put it mildly.