So chapter 1 we're already breaking the main premise and we confirm she also uses space magic. And also that she has trained all affinity magic. So her Kusa/grass magic is her primary magic sure, but she uses all the magics period. And she's at max level.
And we confirm it's not exactly a misunderstanding. She did actually actively cultivate knowingly a lot of dangerous poison. So she was basically in a terrorist cell and was betrayed by her leader under unkonwn circumstances.