Well, she called again today. And for the first time, I was not apologetic. I was very polite, but did not budge. I mentioned the cat food (she immediately said she brought it in at night -- not sure if that's a lie or not.) Then I said that we spoke to several experts (thanks BYC!) who said that if skunks/coons get no taste of chicken, they'll eventually give up on a coop. We've had chickens out there for over 2 months with no problem, so I said that they were unlikely to be the cause... expecially since we have no skunk scent here. So "it must be a problem originating from her property."
I also mentioned that while I had given away an $80 composter to be a good neighbor, that I was unwilling to acrew additional expense when the problem was not ours.
Then I finished by saying that I would certainly keep an eye out for any skunks in her yard, and let her know if I noticed why the skunks were "bothering" her.
I talked a LOT, which is a change from the usual situation of her telling me off. When I was done, I could tell she was railroaded. And she got off the phone rather quickly. I'm sure she'll regroup, but in the meantime... Suz: 1... grump neighbor: 0
Thanks everyone.