Sorry to hear about her accident. Glad she's ok and glad they were able to track down the dirt bag who hit her.
I don't have any advice on what to add or watch for, but I will suggest that you check TrueCar.com for the "going price" before you purchase. This gives you a strong negotiating chip with the dealership, and if you actually end up going through TrueCar to make the purchase to get the price you saw, the dealership has to pay TrueCar a finder's fee so typically they'll just give you the price when you ask for it instead. This also helps you sort out any incentives that are available right now (instant rebates, financing offers, etc.) so you're informed on which incentives you want to take advantage of without the dealership swaying you toward one or the other. Often times they'll push you toward their low interest financing offer but you'd be better off taking the cash rebate instead, especially if you plan to finance through a credit union or something and get a low rate anyway.
My wife had a 2WD Rogue with a CVT trans for 6 years before we traded it in for her Pathfinder. She LOVED it. It was a great car and never gave us even a single problem other than a bad TPMS sensor.
Edit - I just looked at TrueCar and if you're looking for a 2016 model, they're basically selling for MSRP right now ($30k-$31K for an AWD SL). They don't even have the 2015 on their site anymore because dealerships aren't offering "certified prices" on them anymore. If there's still any 2015 inventory out there, you can probably get a good deal on it but you'll have to track it down yourself and negotiate. That's the bummer about buying a new car right at the beginning of the model year - you've got to pay full price. At this point, there probably won't really be any incentives until Memorial Day.
But again, still a great vehicle and she won't be disappointed with it!
