If this professor is on the class schedule and you want to learn, run as fast as you can in the opposite direction. Yes, you will receive an easy A, but you also will learn absolutely nothing because she provides no books or assignments. Clearly, she picks up a paycheck for being a guest lecturer, is accountable to nobody, and has no remorse for being a terrible professor that adds no support to the students that pay for her class, believing they will learn valuable information.

A few handouts at the beginning of the quarter and then ghosted.

The one lecture she provided was insightful, charismatic, interesting, and engaging. Too bad that could not be followed up by another 9 weeks of class engagement. I've never had the experience of a professor ghosting a class before, but there was radio silence until the last week when out of the blue, I got 50 credit points attached to no assignment. I am sure that was to buy my silence, yet I already had an A from those two assignments the first week of class.

Take the easy A if you want, but later, you will look dumb when you cannot explain any behavioral theories.