Did she try it? Or just think it was a scam?
Mine's not up for renewal until next year so I haven't taken it to be validated yet but both the San Antonio Zoo and Groupon seem to be established companies so I'd be really surprised if it wasn't legit.
The day the deal was on Dana from the San Antonio Zoo was answering questions about it all day and a bunch pf people from my San Antonio Natural Parenting group bought memberships and I haven't heard anything negative about it afterwards.