Been falsely acused of griefing on Minecraft?

I was on a Minecraft server, doing Warrior Cats RP. I was near a tree that was burning (no one noticed it). Later, the owner accused me of doing that. She said:
Stop putting fire on my s**t!
I am so worried. I am one of those people that get really worried that when someone gets mad at me online people are going to hate me, lol.
Can anybody help me? I am still so worried…
Thanks!

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