Does she go in the car now? If not, you should start with short trips and then longer to get her used to being in the car. Do you have a carseat for her? Mine love their carseat because they are up high and can see out. Plus, they are strapped in and safer.
Mine love car trips - they sleep mostly. I take water and food in little dishes in the car so they can eat and drink when they want. I also bring a bottle of water and just put a little bit out in the dish - and then put the cap back on the bottle - that way if the dish should spill, not too much gets on the car.
We also bring chew toys, and they chew them for about 5 mins after a stop, then they pass out asleep.
We stop at rest stops, etc for them to potty. You have to really be careful about the trash around these places - if your baby is likely to pick up something from the ground. My Rexy will eat ANYTHING, but Rowdy won't touch a thing on the ground, so thank goodness, I only have to watch one of them.
We carry poop bags to pick up after them - on trips I ALWAYS have bags in my pocket.
When we travel, we take their beds so that they can feel a little like home. They actually sleep with us, but have beds in the den where they sleep during the day.
If we will be out and about with them, we take a stroller or backpack carrier.
I can't give you any advice about the snow - we live in Texas!
Good luck, I'm sure she will do fine!