Unfortunately the TARDIS is just as much of an incorrigible meddler as her pilot; getting involved is what they do. And this really does concern her, if Lucifer is going to keep upsetting Gabriel and possibly hurting the Doctor or anyone else she cares about.
"But if not me, who will? Perhaps none better to put a stop to this senseless feud than someone who wasn't involved in the slaughter of your own kind. Gabriel certainly can't seem to make you see sense, and your god never bothered to step in, if he cared at all." She has some unsavory opinions about that as well, and she's too angry to rein in her contempt for the way his creator has been treating his responsibilities. But she knows how aggressively even Gabriel tends to react to this sort of criticism, so she is ready for an attack, shielding her mind. "I only wish to prevent further violence, especially in this universe."
sorry sorry, I totally do exist sometimes
"But if not me, who will? Perhaps none better to put a stop to this senseless feud than someone who wasn't involved in the slaughter of your own kind. Gabriel certainly can't seem to make you see sense, and your god never bothered to step in, if he cared at all." She has some unsavory opinions about that as well, and she's too angry to rein in her contempt for the way his creator has been treating his responsibilities. But she knows how aggressively even Gabriel tends to react to this sort of criticism, so she is ready for an attack, shielding her mind. "I only wish to prevent further violence, especially in this universe."