Can attest that cause I'm a native German speaker and I took Dutch classes during my school years. Even if we ignored her claim that she "intuitively" knows Dutch, that doesn't make it *that* much easier for her to learn German grammar. Also, pronunciation is quite different. Honestly, German is hard and Jade couldn't even spell "dankeschön" correctly after staying in Berlin for half a year and having a German bf lmao.
Let's be real here - she had no interest in learning German (or Korean) before Minerva sent her to Berlin (and Seoul). And that's okay! But of course Jade has to make learning languages her entire personality now, cause she thinks it makes her more interesting and cosmopolitan. Calling it now, when she goes to Argentina she will post about how she's always wanted to learn Spanish and how her French skills make it so easy for her to learn Spanish.