I graduated in EE in '69. Over my career everything changed at least once or twice. What I found most important was an understanding of the fundamentals behind the practices. That is, the underlying theory, physics and mathematics. With a firm grounding in those and a feel for how to apply them, I could keep up with the changes. I suspect it is the same in most fields.
A couple of earlier posters noted she should do what she really loves to do, and that is of course correct, but concentrate on the basics at first. All else will change. Don't fight the changes, adapt to them, and exploit them. If you love what you are doing, it is part of the adventure.
Still, life is a crap shoot. It takes a little bit of luck as well as careful preparation. Aristotle said count no man fortunate until he is dead.