Of course I could be proven wrong, and it'd be a nice change of pace vs how they usually go, but more often than not this doesn't end up being the case in my experience. Shoujo is littered with stories that could be easily resolved if two MCs just said one more line to each other, but they don't because there's a [Drama] tag, and one of the easiest ways to generate drama that doesn't result in readers actually hating the MCs is misunderstandings (even if it ends up aggravating, lmao).
If they were gonna have Natori successfully resolve things in this conversation, I feel like they would've had it before the cathartic hug moment at the end here. Feels like the more likely outcome is they just calm down, meet up with Lapis and Lapis sulks a bit because of her jealousy she had last chap over Natori wanting to handle Diana alone, but she ultimately doesn't pry because she knows Natori wanted to handle it herself.
Obviously that's getting way into speculation territory now, but I just don't see them sitting down and having a deep talk about it when Natori told Lapis she wanted to handle it herself, and avoided telling Natori Lapis's circumstances. If she was open to having a longer talk with all three of em, I don't think she would've excluded Lapis in the first place.
There's stuff getting in the way of that, though - first is the way that Natori is just totally focused on Lapis, which is skewing her perspective on everything else. Second is the fact that Natori hasn't internalised the way Lapis feels about her (or the fact that they've basically confessed to each other) - she doesn't seem to have any real sense of what that
means, and that's throwing off her judgement with a lot of things, as well as just plain distracting her. Third is the fact that Natori still seems to see Diana as if she's a favourite character in a story - lots of emotional attachment, but not much beyond that, particularly not a whole lot of investment in her as a person. And finally, the biggie, Lapis' plans are indefensible, and as soon as they come up (which will be necessary to explain to Diana the reasoning behind some of Natori's actions, as well as the underlying motivation), everything will blow up.
There are ways that at least some of these could be worked around or circumvented, but they all rely on Natori (as the only person who actually knows all the details) being in a position to basically go "right, you sit here,
you sit there, now both of you shut up and listen", which she's probably just constitutionally incapable of let alone being in anything like the right mindset to do at the moment.
So yeah, this is definitely an example of the [Drama] tag misunderstandings trope, but it's not because the characters are being idiots (at least, not out of character idiots), it's because the plot has set things up such that the misunderstandings are reasonably realistic and understandable.