I don't like her eating candles. It is EXTREMELY unsettling to me. However, I think I have an idea I might try. Remember those "wax bottles" candies? I am thinking about draining the liquid out of them and maybe giving her one of those if she needs to eat something "waxy". That wax is designed to be "ingestible" and safe. I've eaten a few myself over the years. They may still make "wax lips" somewhere as well.
It makes me extremely nervous about her eating this stuff but maybe if it something she needs to do, then let's do it "safely".