In Season 6, E3, Kim and Jimmy are discussing Lalo's death and she suggests that Jimmy could choose to be a rat -- at that point she sounds very much like a criminal rather than a law-abiding citizen. Of course, she does do some questionable things but would she really take the cartel's side in anything? I don't think she would -- she is no murderer even if Jimmy does seem to be willing to be involved with murder indirectly and murderers (like Lalo and Walt and Jesse) directly.
Am I misinterpreting her statement or is she indeed disdainful of behavior that would make Saul "a rat?"