"Students on Campus" Why did the woman make overhead copies of the slides?

Narrator: Listen to part of a conversation between two students.
Man: Hi. How did your presentation go?  Q18
Woman: Really well.
Man: See. I told you.
Woman: I know, but I was really nervous.
Man: So what happened?
Woman: Well, the T.A. asked for volunteers to go first, and I raised my hand right away because I wanted to get it over with before I got any more nervous than I already was.
Man: So you went first.
Woman: Yeah. And I used a lot of visuals. I had about twenty slides on PowerPoint, and that  Q19
really helped me to stay on track. I mean, I didn’t read the slides to the class or anything, but, you know, some of the titles kind of jogged my memory.., so I knew what I wanted to say while each slide was shown.
Man: That’s the beauty of PowerPoint.
Woman: Of course, I’m always afraid the computer program won’t work...and then there I am  Q20
without anything, But; I made overheads, you know; copies of all the slides, just in ease.
Man: So you could have used the overhead projector as a back up. Good idea.
Woman: And I had most of the stuff on handouts so they could follow along without spending a lot of time taking notes. That way I could move along faster and get more in in ten minutes.
Man: Yeah. Ten minutes isn’t very long when you’re trying to present something as complex as population density.
Woman: That’s for sure. The maps really helped.
Man: A picture’s worth a thousand words.
Woman: So true.
Man: Listen, I can’t remember whether you had a group or you had to present all by yourself.
Woman: You had a choice, but I decided to do my own presentation, I don’t know. Group  Q21
projects are really popular but...you know.
Man: I hear you, I’d rather take responsibility for the whole presentation, if I were you.
Woman: No surprises that way.
Man: Is that one of your handouts?... Wow. That looks fantastic.
Woman: It’s easy. PowerPoint has an option for putting the slides on a handout.
Man: Still, it looks so... professional.
Woman: Thanks.
Man: So did you have any questions after the presentation?
Woman: Not really, I think people were mostly just wanting to get on with their own presentations.  Q22
Man: But they seemed interested.
Woman: Oh, yeah. And the T.A. said something about "getting off to such a good start," so I felt good about that.