Just seen the updates on Winnie.
If she is unspayed and living with a male cat, even if he is neutered, he could be pestering her and she is just trying to keep away from his unwanted affections. One of the other things that annoyed Marble (in addition to Soap) was Bourneville being a sex pest...even though they are all neutered!!!
I know your trying to get the neutering point across and I'm guessing you've already suggested Feliway...if so, did they try it? This new stuff I got from the vets appears to be faster acting...could that be reccommended? Would they even try it or have they given up?