need help, having a "group" issue Options

[marzipan]

My best friend and I are working on a project due in our history class, and we're going to be presenting on either Monday or Tuesday.
It's a split project between two people with one doing a PowerPoint and one doing a poster.
She did the poster, and I did the powerpoint.

Here's the issue: the powerpoint, in my opinion, was a bigger part of the project because we needed more information on it. I have all my notecards laid out, and all my information ready. She told me Friday, at practically the last minute, that SHE wanted to present part of it with me. She had told me earlier that she wanted to present the poster, and I was fine with it. I have a problem with her taking the credit for all the hard work I did and wanting to present it when she doesn't know half of what I researched.

She ALSO tells me at the last minute that she doesn't know what she is going to say about the poster.
-_-;

Is my reasoning correct on this problem?
I want to present what I worked hard on, and I don't want her to act like she did the research as well.

[marzipan]

Thanks for the comments everyone.

beaucoup: Our original plan was for me to do the powerpoint and her to do the poster. She wanted to do part of the powerpoint at the last minute. Thanks for the advice. I'll tell her that.

steve330: It's a grade for both of us, but our classmates watch us present and grade both of us separately. But I think that if she did badly on the presentation, it would affect my grade.