I've always used a Kenmore. My mom had one that I learned on. Then I got a hand-me-down with only two stitches. As a graduation present to myself, I got one in 1981 that I still use today. It does 12 stitches and has a setting for stretch stitching (from the days when polyester was king).
I had to have it repaired about ten years ago when it accidentally hit the floor. The repairman had good words for my machine because he said the working parts were metal rather than plastic, so it was durable.
My mother-in-law was a professional seamstress in her small rural community for years until Walmart came into town and brought ready-made clothes to the masses. Then she switched to quilting full time. She was a purist when it came to quilting and never used any machine stitching.
She was also very picky about her sewing machines. She had a bunch of them because she'd find that they would go too slowly for her. She could whip out a straight seam in no time flat. With a beginner that's not really an issue. She also had an antique treadle Singer machine which was probably her first.
It used to be that there were sewing machine stores where you could go and test drive various machines. Sears used to have an area in their store to try them out.
I'd advise not to lay out a bunch of money at first for all the programmable bells and whistles. Start with something simple and inexpensive (you can find them in thrift stores very reasonably), and buy something bigger and better as she figures out how much sewing she'll actually be doing and what bells and whistles she'll really use.