Why did snapchat say that I screenshotted someone's stories when I didn't?

[Welcome To The Jungle]

I was on Snapchat, I looked at someone's story, and a few minutes later she sent me a snapchat asking me why I'd been screenshotting her story photos. I checked my camera roll, and the photo's weren't there. I told her it must have been a glitch, but she didn't believe me. And I have to face her at school. Why did this happen and how can I convince her that this can happen? I don't want to look like some creepy stalker.
Ri: Things are awkward between us. She's being rude to me and seems to think I'm annoying and angry, which I'm not. Do you know why this might have happened? :]

[RL]

Just tell her you didn't. If she doesn't believe you, she doesn't believe you. Showing her your phone is a violation of your privacy, and you could have deleted or moved them anyway, so it wouldn't prove anything. What's the big deal?