No no it definitely is not in the game itself currently, but the way the whole scene plays out and how the next morning plays out is clear indication there is missing content that is supposed to be there.
Oh okay! That makes more sense. And yeah, Minthara's romance is just barely there, hardly any content and no reactivity whatsoever. I think they put all her budget to her Act 1 scene and thought that was enough lol.
I’m personally not 100% sure the romance scene in Act 2 is missing content, like I think the no fade-to-black and no scene playing is how they
always intended it, which is very misleading. It would be the perfect place to add another romance scene for her and would make for a more natural progression of the relationship, but I’m not too optimistic about them implementing this in the future. The more people ask for it, the more likely Larian will listen though.
What I assumed was (and this is the bare minimum) the next morning we would be able to access her romance dialogue tree, which would mean we can kiss her in camp and that she would have a different greeting. The former is apparently a known bug (that has been seemingly ignored) and dataminers have discovered the lines. As for different greetings, I think this just hasn’t been worked on at all as there are no traces of it that I know of.
It's definitely jarring that we have no indication to her romance at all outside of the Love Test and the drow twins. Everyone else seemed to have gone to full release but Minthara is still stuck in EA and Larian isn't even batting an eye at this.