Can you intercede and take the mamma and her kittens? I know it is harsh but these people are a danger to those kittens and mamma. Mamma needs to be spayed the more times she goes into heat and the more times she has babies the more chances she has of developing cancer. Also if those babies go untreated it could mean their sight or worse. if you can't step in yourself then can you get a non-kill shelter or a rescue to help?