I have had an experience with an instructor that I won't go into here, because I still have to graduate in about a month and 3 weeks. Her problems are well-known and talked about, and all that talk isn't worth a hill of beans. However, our clinical evaluations are kept in hard copy at our school. Teachers sometimes write comments; students are encouraged to do so as well.
There is a very high probability that I will be addressing that issue with the dean of the department, and the president of the school, when I graduate. If students are required to be professional then by god, so are the instructors, particularly when they are doing narrative documentation.
As for what you should do, I agree with the other posters. Prepare yourself, and the part about presenting your daily "plan of care" is wonderful. That way she has an idea that you want her to know when she can expect to find you doing what things. I don't know what to make of the "actress" comment. Count to ten sometimes before you speak and whatever you do, don't interrupt the instructor. I know, some people have these long pauses in their speech that make you think they are done- then get their panties in a wad when you speak.
If you can, find some good quality in this instructor that you genuinely admire, that way if you are asked your opinion of this person, you'll have a decent answer. I am beginning to get tired of the thing I admire about a particular instructor though. It wears me out saying the one nice thing because I wasn't born to be a diplomat.
Oh yeah- if you're a caffeine junkie, cut down on the caffeine on clinical days. Don't leave it out altogether, just back off a little, and make sure you eat a decent breakfast no matter what time you have to be there.
Good luck to ya!