I don't see a downside if you don't mind the table fee. If you'd willingly give the money, then you should.
However, she'll be doing the donating, so you'll not get a tax credit, if that's an issue for you.
I'd do more of an informational, as you mentioned. A few pieces. Maybe a book of photos. And lots of cards along with your show schedule to hand out. Maybe a discount code to use in your Etsy shop, too.
My only issue with it, though, is what about Texas & Florida and everyone else? I get that Puerto Rico has been hit very hard, but lots of people need help. I'd be happier with a hurricane donation to the Red Cross, but that's just me.