Add me to the chorus that she wanted it free. Molly's JADEing might have made it worse. Molly says, "I wouldn't know how to charge you," lady thinks, "That's the point! Don't charge me!" Then, entitled lady things Molly just isn't picking up what she's putting down so she tries harder. Molly explains, she gets more frustrated, and so on.
Molly would have faced less flack with, "Sorry, we don't sell it. Try next door. Have a wonderful day!" and walk off. Explaining made the woman think she had a chance. You can't reason with entitled.