Cat eating sponges

If your cat is actually eating the sponges this could cause an intestinal blockage so it’s pretty serious! If she has eaten one recently you should go consult a vet. If you mean she just chews on them, the situation could be less urgent but you should still stop her from having access to them. I don’t think you can train her to stay away from the sponges. If I were you, I would just put some sort of box over the sponges. Or maybe place the sponges in a cupboard instead of leaving them out in the open. Best wishes!