What should I do in a misunderstanding?

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(It's short, just read the first two paragraphs and help me please) To sum it all up, I am in an awkward moment with Chem because when Kat heard my conversation with Ms. Park and told Chem that I said her work is confusing. What I told Ms. Park was the program is hard to get used to, not Chem's graphs. The problem: 1. How can I straighten out this misunderstanding? I tried to explain it that time but Chem was too angry to hear me out. And explaining further will only make me sound questionable and suspiciously lying which is not true! I have a firm respect for her and I treasure our friendship. 2. I think Kat intentionally made that false conclusion since she kept bad mouthing me since first year. I feel this uncontrollable anger, is this justifiable? THERE IS NO NECESSITY IN READING THE NEXT FEW PARAGRAPHS, IT'S JUST DETAILS. If you're interested in the story then go on and read: At a group term paper, I was assigned to do the interpretations of graphs. When I gave it to Ms. Park, she told me that there were several errors in the graphs and interpretations. Chem made these graphs so I quickly pointed out that it was Chem's work not mine so as not to gain her credit. I apologized to Ms. Park for asking her to change some graphs from pie chart to bar graph and some graphs spelling errors. I wasn't able to change them because I am not used to MS word 2007. Kat, who was eavesdropping on my conversation with Ms. Park misunderstood what I said. She thought that it was the graph itself that was confusing and wrong. She told the Chem, so she was furiously angry at me. After all, those graphs were hard and it really looked well-made. There were other times that Kat bad mouthed me and I can't help but feel angry at her for causing the misunderstanding. I think she is very competent in grades and class standing so she keeps attacking me from behind. I am fairly one of the highest in the class especially in major subjects and I kept feeling paranoid that she'll do everything just to drag me down.