Keep skiing with her.
Especially if you can tell whether she’s a progression-oriented/driven person who will enjoy skiing because of the opportunities to learn and push oneself.
When I first skied with my partner she’d never set foot in the park. But we kept skiing, the mountain and the park. She was frustrated by rails and larger jumps for a couple seasons. Once she figured out rails and flips, she’s been hooked on park skiing ever since. 6 years later, our days on snow are some of the most meaningful time we spend together.
Obviously, if this isn’t a serious relationship and if you have no goals of making it one, then sure, don’t spoil skiing over it.
TLDR: skiing with your girlfriend rocks, and you’ll never know how good it is unless you try it.