Coming to your rescue!
So, I’ve often advocated for a mixed approach to learning----meaning, an appropriate mix of learning-by-doing, theory, and practice. I could just be speaking for myself, but I truly think those ingredients are essential to knowing something (anything) deeply and being able to do it really well.
Based on that…
DesignLab’s UX Research & Strategy course is a really good opportunity for learning-by-doing. It’s not cheap ($400) and there are a LOT of projects to do in just 4-5 weeks’ time, but it’s a great opportunity for people who are literally just getting started. I have my quibbles with it, but I think it does do a great job of laying the foundations.
Interaction Design Foundation’s courses (specifically the combined undertaking of their Design Thinking course and their User Research course) would be excellent for the theory/mind-training aspect.
The foundation of those IDF courses would have already been introduced in DesignLab’s course, but IDF will go into much greater detail and explore additional topics. (Just without the projects.) So, a good jumping off point–especially after already having the experience from DesignLab. She’d also gain access to the other courses. Given the low cost ($100ish?) of annual access and the unlimited, high-quality courses to choose from, IDF is an excellent value. If you take those two courses I recommended at the same time, they’d last for ~2 months.
If she wants to spend as little money as possible and is confident in her ability to teach herself, Understanding Your Users by Baxter and Courage is a great book. It has a nice mix of theory and industry tips.
The practice part, of course, will be whatever “real” projects she chooses to take on after the fact (or during) to get her feet wet.
I’m naturally skeptical of any course’s ability to launch someone into a new career, but these are the resources I’d recommend to anyone serious about learning how to become really good at UX research.