I think there is a sense of Ginty being genuinely a bit caught between selves and between different desires and wishes, here -- some of it, for sure, is an affectation of sensibility brought on by Unity's influence (that's explicitly canonical), but I suspect it all ties into her deeper fear of failure, which is a real feeling. Rowan correctly identifies (IMO) this fear later on in the book -- it is REALLY this, not the sea at all, that's made G. flake out? -- and this trait continues into Cricket Term and beyond. But it's all muddled up with pretended feelings, because of Unity.