Diana had not ever been the one to pursue a relationship. She had been alive for nearly a thousand years at this point, as she had told Thor. Eight hundred years of that, give or take, had been spent on the island of Themyscira, with the other Amazons. Some she was related to, many she was not, but Diana was straight, presumably. Or, at least, she had never indulged with some of the other Amazons, nor felt the desire to. So she assumed she was straight, which would be the modern terms for it now.
After leaving Themyscira in 1918, Diana had only had one relationship, and that had been Steve Trevor, in the middle of a chaotic and stressful wartime. Diana had flirted, surely, but Steve Trevor had been the one to close the gap between them and teach her how to do any of this practically. She had seen him again in 1984. Other than that, Diana had been alone, romantically and often socially.
So staying calm and collected was all she knew, and she did it, despite the fact that the excuse of a book had been intended to get her some alone time to think. But she was tired, and there was no way she would focus on a book. She had also already told Thor that this naptime idea sounded like a good one, and it probably would result in them sleeping, so Diana did still want to try that.
Did she want to find a quiet corner just now and curl up with Thor, after what had just happened? Not really. Was she going to, because she’d said she would, and it would help overall? Indeed she was, and the smile on her face betrayed absolutely none of what was going through her head, unless Thor was watching for it. And Diana did not know that he was. “Of course we can. I’ll have to wash this dish first, but we can find somewhere suitable, if you like.”