This is a good time for an update
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By her own admission, she enjoys the romantic Otome stories (the ones with choices that affect the outcome of the story) the best. They're the electronic version of corny teenage books when I was coming up. None of these have explicit sex or violence, and while they are sappy and a bit unrealistic (a prince of a European country marries a Japanese commoner?), I have read them and don't see a big harm in them. I have pointed out how a jackass isn't the kind of guy she wants, and she understands that. Many of these guys act like jerks or exaggerations at first, before revealing a softer side and the main conflict of the story.
She has to watch out for stories set in feudal Japan which do tend to get violent and/or explicit. Much of anime she enjoys for the music playlist or the artwork (she's an artist).
So, as long as she's keeping up her grades, doing well, and not favoring anime guys to real people, I don't foresee a big problem. She enjoys it when I watch with her, so that's good
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Thanks, everyone!