Welp, Shi Faust can, in fact, solo MDE without much issue.
The most painful part was literally floor 1 cause I was a retard and picked the Manor pack without something to deal with the Dead Rabbits.
Resolution as a gift is definitely balanced and El Director doesn't need to nerf it at all; it is totally alright and not at all singlehandedly carried me through all 14 floors.
And, as you can guess, I used her arrows only by literal accident because I used her defense skill as a defense skill. My skill fucking 1's did more damage than those arrows.
She's perfectly serviceable, especially on Bloise, but her gimmick is quite literally pointless to ever use unless you are actively trolling. She does like 10x damage just by using her regular S3.