There are programs that are funded specifically for feral cats. They are trapped, vetted and spayed/nuetered and released back to the "wild". There are even grants available to fund this type of program. By feeding these cats she is just adding to a growing problem. Maybe you can do a little online search for a feral cat program in your area that can help her make a real difference for their stray animals. I'm sure she is just upset thinking they will be PTS if the animal control gets involved.
I have to say, I side with you on this one. She is not being responsible in her actions and she needs to be put on the proper path.
__________________ “Never argue with a fool, onlookers may not be able to tell the difference.”  Mark Twain |