It used to be the wick discussion. Zinc and lead and all that crap. Now its the environmental discussion crap. Tell her your candle is safe as long as she burns it in a well ventilated room, away from curtains or flammable materials and that it does not emit radiation, lead, or cause birth defects. She may be more understanding if you refer to paraffin as "candle wax". There are many chandlers who offer both soy or paraffin candles. Keep the customer satisfied.