If it was me, I'd remind her to make sure that she's comfortable with possibly losing $30 and tell her that you'll buy it from her at the current market rate if she ever want to sell, and then send her $30 worth of Bitcoin out of my own wallet. That way, nobody has to mess with the exchange fees and she gets $30 worth of Bitcoin.

And for the people saying that old people don't get Bitcoin, I'd just say that there are plenty of young people who don't get Bitcoin and wouldn't give a rip if there was a way to make Bitcoin sexy and cool to the non-tech savvy people.