Stechkin's base version already got a pass for being usable.

Her mod gives a slight increase in her capabilities buff-wise. Her passive basically tries to turn her into a sorta-DPS to go with her buffs to allies, but TBH you'd be fine leaving it at the slight increase in power Mod 1 gives.

At some point, G&K started running out of real guns and broke out more of the early 20th century guns.

Surprisingly, the dolls with them are actually not godawful.

If she's the leader, she gives a general buff, but whatever, most HGs do that. What makes her interesting is that if she's NOT the squad lead, she buffs the hell out of them, thus making her useful in any formation where you want to pack as much as possible into one doll's ability. Lookin' at you, M4, IWS. (And a few others)

Another of those HGs that buff based on leadership position, with the Squad Lead getting an alright shield and everyone else getting an FP boost (as opposed to P22 which is positional based). Sometimes you might need that mix. If you do, there you go. Else, she's basically a slightly off-brand P22.

Not even a solution in search of a problem, she's a bunch of solutions to a bunch of problems implemented extremely badly. A victim of Mica's experimental phase, as one of those dolls that don't fucking work. Instead of an infinite duration toggle, she has actual skill durations and alternating effects, making it increasingly unlikely you'll get the effect you want in the time you want, since you need to wait for cool downs to use them.

To top it off, her %s aren't even very good and are even more garbo during the day. There are better options if you need 1 or the other, like Mk23 or TEC9.