Given that the most common complaint about friend zoning is hearing a woman complain about her current relationship/sex life, leading a man on is NOT a universally accepteted component of friend zoning. If she were leading you to believe there might be a relationship or sex, she wouldn't be having other relationships or sex and then complaining to you about it.
What you are describing is a form of gold digging, and you don't want that girl as a friend or girlfriend anyway.