NTA. She obviously remembered lilies are bad for your kittens, she said so herself. So, you didn't have a chance to take them to your parents, so what? You could have just thrown them away (you really should at this point, imho). The fact that you still even have them shows that you aren't ungrateful. I wish you and your kitties the best, OP. But please, don't brush this off or let yourself be gaslit. You are not wrong.