Jennifer had been raised by her grandfather to not talk about magic with outsiders. Because it was dangerous - you might think someone thought it was all smoke and mirrors, but they could just be fishing for information. But ... she had telpeorted into this woman's house, and was having tea brewed for her.
Plus, Zatanna had done that nifty trick with the quick change, so there was more then smoke and mirrors going on here.
"In the family. Long proud tradition in the Kale line of hanging out in swamps, and keeping to ourselves." She smiled somewhat wrly. "And of course banishing demons, and try to keep our little slice of Florida safe."