Maybe pretend you took it as a joke. Or alternatively keep track of it, then a few days later ask her questions about it. Like if she had claimed to have flown helicopters: "Hey how many hours flight experi  3e16  ence do you need to have before you can do tourist flights over NYC?" You don't want her to think you are testing her, so just accept whatever she says, nod and claim it's interesting - just let her sweat a little. And you can bring up people with common interests - "Oh I think Greg has a pilot's license you should talk to him!" (Doesn't matter if Greg has ever seen a plane, she'll probably avoid him like the plague after that. And even if she finds out he knows nothing about the subject, you have simply misremembered that little piece of information. Who could blame you for that?)