Her excuses went from "I only ride on normal slopes, i dont do the park like you" to "it makes you look like a pro, i dont want to look pro". Meanwhile i wore my helmet whether it was a bunny hill or a 20ft kicker (max for me so far). But we are going helmet shopping this weekend. Bit late in the season, but better late than never.
One of the minor benefits: A yardsale with a helmet is just a slide, gather your composure, keep riding.
None of this unclipping to collect your goggles & beanie which flew off when you fell, then trying to clear snow from your gear. It all stays on your head...