If the truck she has is usable, then keep it going as long as possible. The marketplace is in collapse and is nowhere near the bottom yet. This gives her time to be picky.
Not knowing her financial situation limits any advice you can get. Also, who does she have available to help as far as getting usable information.
A great place for used cars is the church bulletin board or newsletter. Don’t look for something particular but something that’s a good deal. A twenty-year-old luxury barge from a retired couple may have as little as 20,000 miles and cost as little as $2000. I’ve owned several Town Cars and even given a few away to people in trouble.
Network, network, network.
A Mercury Marquis that’s within the last 5-6years of of manufacturing could be a great option. My mom has one that is a 1999. 275,000 miles on it. She has to put $1,500-2,000 into it every 3-4, but it still has a great smooth ride.