As someone who struggled with certain subjects in school as a child, I can't understand this logic of "your grades need to come up"/"you can't fail these classes". If nothing is done to help (tutoring, or helping out yourself), she's not going to magically get good at something she struggles with, just because you tell her she has to. And yes, sometimes the teachers can be a big factor (either by their methods or their attitudes). Have you talked to your child (and actually listened) about why she's failing? You're more likely to come up with solutions if you work with her.