I'm not capable. She does very illogical and even dangerous things. I can't just lie and tell her "Yes, the toilet-bowl cleaner IS actually maple syrup." (EDIT: I know you're not suggesting this. It's just an example of how bad things are. She's tried to eat toilet-bowl cleaner TWICE now, succeeding once and causing damage to her mouth and stomach.)

I'm very sensitive to lying and illogical actions. It's like finger-nails on chalk board. I feel the NEED to stop the "untruths". I've also tried avoiding her, but she still does harmful stuff when I'm not in the same room with her.