I did the same with SWMBO the first time we went to MN in the dead of winter. I had her do all the things you're not supposed to do on snow and ice just so she knew what it felt like when things are going wrong. I did try to teach her corrective actions, but real-world vs parking lot leaves a lot to be desired. I'd be more comfortable with her winter driving if we could ease into it - as in we live in the area and she can feel it out as the seasons change. She hasn't developed the instincts for it and dropping her in doesn't trigger things like it does for me.