You'd think she'd at least give it a loop or two of trying to actually succeed at St. Lucia. Literally every long-scale time loop story I've ever read (original Higurashi included!) has "school becomes boring and easy because they already know all the material" as a minor plot point. But nope, Satoko dum dum, can't into school, gotta murder.
This episode really, really needed to adopt that shiny new Nekodamashi technology and run through five or ten or a hundred loops in one episode. Without the element of endless repetition wearing away at one's sanity / humanity, there's exactly as much justification for Satoko's actions now as there was last episode -- namely, zero. We're barreling down the road toward "wow crazy lesbian so cool and edgy", and I thought RK07 was better than that. It's like Gou is a story written by someone whose only experience of Higurashi was reading the Wikipedia article and then watched a ten-hour USO DA + murder compilation on Youtube.
...Now, on a nitpicky, in-universe note, can I complain about the absurdity of Satoko looping into not just any random world, but another version of Matsuribayashi? So much for hundred-year miracles. Oh, you need a happy timeline? Grab one off the shelf, we got 'em. Oh, and you want the Rika in that world to somehow have the memories of being a looper, despite that making no sense at all with how her subjective experience of each fragment is supposed to be consecutive? We got that covered, too. How? Quiet, you. A witch did it, I refuse to explain!
Seriously though... Rika's memories make no sense. We're flat-out told that from her perspective, Onidamashi is a direct sequel to Matsuribayashi. Five years pass after Matsuribayashi, she dies, then Onidamashi starts, it's followed by Watadamashi, and so on. So where / when did the fragment from this episode happen, relative to Rika's memory? Her dialogue (plus, y'know, the fact that they defeat Takano) indicates the Rika in this episode has her memories at least up to Minagoroshi. So how the heck does that work, cosmologically? I say with certainty: there's not going to be a satisfying answer to that question. It really shouldn't matter -- I never asked this question about Outbreak or whatever! -- but when you take your show in this direction (dropping crossover bait, leaning on and expanding air-quotes lore at the expense of the characters and themes), these are the sorts of questions that you're asking your show to be judged on. If you fail even on these metrics, what's left?