Makes no sense. If she thinks the Versa is so unsafe, why even drive it anymore?
Sell it, then get a vehicle that will actually be useful in both seasons. But frankly, any vehicle is useful in the winter if you have proper winter tires.
So your options are:
1. Put a set of wheels and winter tires for the Versa. This will allow it to be driven throughout the year and have two sets of tires. Would cost less than another vehicle (which probably would need tires anyways).
2. Sell the Versa taking the loss on depreciation and but a different vehicle that makes her feel "safe". Odds are it'll be a small suv, and in the end she'll realize it's not much better especially in the summer months. If winter driving is a concern, then maybe something with AWD would be for her (ie a Subaru).
Option 3:
Option 4 which is to do what she wants and get that second vehicle for winter doesn't make any sense here. The only time I would do that is if I want to park my other car to minimize rock damage and/or lessen the amount of km's I put on it. Otherwise, I would only do it if I had a nice sporty car which i put money into and don't want to ruin it in the winter. A Versa does not fit that bill.