You're a mental bastard why would you want her snowboarding with you?! No peace and quiet, yapping in your ear on the lift, slowing you down on the slopes and no doubt complaining about everything from sun in her face and snow in her vag.
Do the right thing bud, tell her theres a change of plans.. hand her the tea towel send her to the kitchen and tell her to have the fucking dinner ready by the time you're back from shreddin with the fellas or she'll be getting your 160 powder deck round her coupon!
I bet you have no girlfriend.
I would look into Roxy, the boards are pretty. They are women specific for sure as far as flex and cut go. I have a vagina and I never got snow in it.