So I got this reckless driving citation. What should I do?

K. So at lunch at school I left the parking lot with two other friends in my vehicle. Leaving the parking lot I saw no one and turned right so I could head to mcdonalds. Driving down the road aways (going 45 on a 40) I changed lanes to get to the left lane. I didn't see a lady in my blindspot and accidentally cut her off. Shrugging it thinking it was no biggy I continued my way to mcdonalds. Arriving at mcdonalds my friends and I got out of the car, only to be welcomed by a botching british lady yelling I couldve killed someone. I ignored her and me and my friends walked into mcdonalds. Forgetting my money I ran to my car and the lady was out of her car behind mine calling the cops and getting the license. I didn't say anything just walked back into mcdonalds. And I went back to school and an officer showed up and told me I'm getting a citation for reckless driving. The officer said that the lady stated I cut her off leaving the school parking lot. And I cut her off later up the road becuz I had been racing some friends. No way was I racing anyone. Something about her statement didn't add up. If I was racing I had to have been going fast. Having to cut her off twice means I shoulda been ahead of her. But somehow she manages to get to mcdonalds before me. So the officer told me I need to show up to court. And there was no price I could pay it off on the citation. The officer said he wasn't involved. It's me against her. And so I was thinking the school has cameras. I went to the janitor camera guy and we pulled up the footage of me leaving the parking lot. There was no cars behind me for a good three seconds. I had cut off no one. And the citation said the incident was at the road when I was leaving the parking lot. It also said the incident was at 11:27. But I left the parking lot at 11 31. It says I have to show up to court bla bla bla for reckless driving. So what should I do. And what's the most trouble I get in.