Is there a way to file a report about such things? I'm not really sure. I mean... not animal control, but some sort of police report? Does that relate? I mean, cause you talked to the neighbor and the cats are technically her property and responsibility. If the cats are harming your property and impeding your activities of daily living, that can surely become a legal issue.
I do like cats though and would act differently. But seeing as you can't even act differently because of your allergies, telling you what I would do wouldn't really help. :P