Of course, Miki isn’t really helping things. One trend you tend to see is that after her first attempt, she doesn’t really ask Setsuna about potential topics. She doesn’t ask about her interests aside from dancing, doesn’t ask about if she has anything she wants to talk about, doesn’t really try to fish for potential topics that Setsuna might actively be interested in. She just jumps to either trying to talk about things she herself is interested in, or things she assumes that girls would be (Which also coincidentally aligns with her interests), kind of forgetting that Setsuna is in a rather different position than most girls.
And of course, it kind of fails, because fashion isn’t something that Setsuna is particularly interested in. Now, Miki gives it one more try and asks about school and gets a similar-level response; like, part of this is definitely Setsuna kind of working out an identity for herself and really being able to properly have these sorts of dialogues. This isn’t all on Miki here. But I think that part of it is.
First, it was touched on earlier, but it’s nice to know that Setsuna is getting closer with Buki too; complete dependence on Love for friendship wouldn’t be good for her.
As to the question, though, their approaches would probably be opposites, but in a positive way. Love is somebody that would dive headfirst and kind of get Setsuna to experience things as much as she can, whereas Buki is more inclined to let Setsuna more speak her own mind and have more of the floor, though willing to jump in when need be.
Miki is kind of caught in the middle of that spectrum. She’s somebody that doesn’t necessarily have the raw charisma (or at least chemistry) that Love does with Setsuna, but also isn’t necessarily being as deferential as Buki might be and letting her communicate at her own pace; note that Setsuna could just want some time to relax on the train right now, and her short answers are trying to signal that.
One thing that we saw in her episode taking care of Chiffon is that Miki has a problem of trying way too hard and also tending to look at things through her own sort of lens, and we see that here too. She clearly wants to get closer to Setsuna, but she both is simply being incredibly aggressive about it in many ways, and putting a good deal of focus on what she might be interested in talking about, as opposed to what Setsuna might, and not digging deeper into that when not directly prompted. Which kind of is a recipe for things not going that well.