I am imagining that once Rey senses Leia from across the galaxy, she knows that Leia is already committed to sacrificing herself to save Ben. Leia may not be strictly doing the same trick that Luke did, but I think it’s similar enough that Rey would understand that the only thing she can do at this point is honor Leia’s wishes. So I think the first line you provided is stronger here.
I don’t see why TFA couldn’t be used as a source for Maz, since they have the same voice actor.