The thing is, none of that is done to protect her friends, as you claim. On Pasaana, why didn’t she tell them, “We have to leave, now! Kylo is coming!” She just…wandered 100 feet away, as if that would hide them from Kylo? On Endor, she had no clue that Kylo would show up; “they didn’t have time to wait” because the film gave them an arbitrary 16 hour deadline until Doomsday. And on Ahch-To, she doesn’t mention her friends even once. She just said “I saw myself on the Sith Throne. I’m scared of my own powers. I’m going to hide here so that I can’t fall prey to the Dark Side.” She goes to Exegol to face Palpatine, not to protect her friends. (If she’s trying to keep them out of harm’s way, why does she provide them directions to get to the battle?) If you want to make an argument that she’s trying to protect her friends, you can; but there’s no evidence in the film that supports that beyond speculation and wild (re)interpretation.
It’s not really wild reinterpretation when the entire (unaltered, I might add) novelization supports the interpretation I’m suggesting. At pretty much every turn in the novelization Rae Carson is suggesting that Rey is distancing herself from her friends to keep them safe. And for myself, that makes the most sense.
She confronted Kylo on Pasaana so her friends can escape, and she knew Kylo was in possession of the dagger so he can track them to Endor. As for Ahch-To, she is afraid of falling prey to the dark side because of what it means about her. I need you to understand the difference. If she turns to the dark side, she imagines that she would be abandoned by her newfound family where she found belonging, and possibly hurt them as well. She is distancing herself from them all because she thinks that’s what they ought to do with her anyways. To quote TestingTheTest, it’s her “toxic, core belief.” Being abandoned (whether intentionally or not) at a young age can kinda mess you up that way.
EDIT: And obviously Rey opened up the way for her friends to Exegol because she can’t take down an entire fleet. That’s just dumb.