Wish I could have been there, great job to those who went to stand up and try to reason with her. Thank you!
One minor point, I hear this a lot in gun debates:
Comment: "We have a registration fee on cars, so we should have registration fees on guns."
Reply: "Car ownership is a privilege, not a right like gun ownership".
It's good to remind them that gun ownership is a human right, even though they don't agree that it is. However, nothing says that we don't have a right to car ownership. In fact, it can be argued that we do have a right to own Cars. The Bill of Rights isn't an extensive list of what we have a right to own or not-own. Cars didn't even exist back then. Kinda like how the 2nd Amendment protects more than muskets that some anti's thinks it only protects. Many framers argued against including a Bill of Rights partially becauses Government might get the idea they can do whatever they wanted as long as it wasn't protected in the Bill of Rights (which they already do). Although yes the Bill of Rights does call out the most important rights we have.
Another point, even if the Bill or Rights or 2nd Amendment were gone. Those rights would still exists. The Bill of Rights doesn't give us those rights, it only helps protect them.
I think they key point to make is that you can't tax a Right, because that will take away the right for those who don't or can't pay. It's like putting a tax on free speech or choosing a religion.
You can also shove it in their face that they are lying because what they are proposing is actually NOTHING like car registration.
Then explain with this suggested advice from John Ross:
THEY SAY: "We require licenses on cars, but the powerful NRA screams bloody murder if anyone ever suggests licensing these dangerous weapons."
WE SAY: Nothing, usually, and just sit there looking dumb.
WE SHOULD SAY: "You know, driving is a luxury, whereas firearms ownership is a right secured by the Constitution. But let’s put that aside for a moment. It’s interesting you compared guns and vehicles. Here in the U.S. you can at any age go into any state and buy as many motorcycles, cars, or trucks of any size you want, and you don’t need to do anything if you don’t use them on public property. No license at all. If you do want to use them on public property, you can get a license at age 16. This license is good in all 50 states. No waiting periods, no background checks, nothing. If we treated guns like cars, a fourteen-year-old could go into any state and legally buy handguns, machine guns, cannons, whatever, cash and carry, and shoot them all with complete legality on private property. And at age 16 he could get a state license good anywhere in the country to shoot these guns on public property. Sounds great to me."