[There's a pause here, because Qrow genuinely does not mean to patronize or condescend to him, but it seems to Qrow there might be a simple solution.]

Well...isn't it like you said? The kid doesn't stop floating around the house 'cause she doesn't think she shouldn't be able to anymore. And you weren't sick the last few days. Maybe you just need to focus on what that felt like, and pushing that image outward onto yourself. You remember what this place looks like, don't you? Try to picture it.

[Admittedly, he doesn't know if this advice is as useful for magic that comes from the blood, rather than the core of one's soul, but it's the only way he knows to think of activating powers -- to reach deep within oneself for the source of power, and then to push it outward into reality.]