That is so wrong of that Creep.to stick you with 3 Young Cats.And she obviously lied to you about taking them to a Vet,they were probably her Cats all along. Never feel badly for doing the Right Thing,as you are these Cats only hope.I just hope,that Creepette does not know,where you live,as if you clean up the Cats,and get them healthy,she may claim them.
Our Prayers are with these Cats,anf hopefully thue will find Furr Ever Homes!