I feel like people are way off with the predictions here.
All I'm thinking is that she might come off as a bit insensitive at certain points in regards to his trauma—such as the downplaying of his trauma with her own "experience", not quite understanding the nuances behind his trauma, and from this chapter, the way she says "you won't be afraid of anything anymore if we worked hard together" (cause while they theoretically could, it would take so much more effort and professional help to properly overcome such traumatic experiences.
My prediction's just that she's gonna come off as a bit insensitive (not by malicious intent), they're gonna have a falling out, might have a more proper talk about his feelings on his trauma, and possibly would lead to the girl understanding him more and be willing to work through that slowly.