Tomato Plant Question

Tomato Plant Question

Hey, I'm new here :) I'm actually not a gardener, but my little sister is. She's currently growing tomatoes, bell peppers, and assorted herbs. However, there's something wrong with the tomato plant. While the fruit itself seems fine, the leaves have been turning yellow and brown, and eventually turning completely brown and dry and curling up. Based on some stuff I've read on the internet, I think it might be Early Blight, but like I said, I'm not a gardener, so I have no idea. That's why I'm posting here, to get your expert opinion! Any help or suggestions is welcome. Thanks!
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