DS did a presentation on spiders in first grade when he was six. He practiced presenting it exactly once. I told him to start, he started crying because he did not know how to begin. So I wrote down exactly one sentence for him, something like "today i am going to talk to you about spiders" and then he just went through the material he had completely by heart.
At this age, for presentation skills it must suffice to speak loudly and clearly enough that the teacher understands what you are saying. If the other kids understand it, it's a bonus (with our kids, there is a good chance that a lot of the information will go of their heads anyway. She won't need to look at her notes so just tell he to look at her best friend in class and speak. The one thing that I agree must be practiced is clicking the slides along without having to look, just a quick glance to check that it's the right slide up there. A lot of adults can't do that! Also, a rule of thumb for a PowerPoint presentation is one slide a minute - how many minutes is she supposed to speak? It was five minutes for our first grader.
She must be satisfied with putting most of her content in the written report. After all, non of the other kids will have the historical background that you two have researched for weeks. Most important presentation skill - think of your audience!
