An RF that was originally slated to be so good that they nerfed her before her release. Unfortunately this current incarnation is nothing special. +30% each to Crit Damage and RoF is a ballpark 65% DPS increase, +/- a bit due to RoF depending on the level yours is, assuming 100% crit rate. This is... not inspiring compared to what some other rifles you already have might put out. You can fit her on whichever style RF team if you want to use her. If you want a top end version of this, use R93, who has a better version of the gimmick.

Modded version of M14

What's there to say? Blood for the blood god, etc.

She gets bigger %s on her self buff and on Mod2 she buffs her own crit damage. You really want, if possible, to get that Oath ring on her for the extra stats at Mod3. While the new skill %s seem low, combined they pretty much exceed Lee Enfield's self-boost and part of it is a passive. It retains all her old advantages, but just embiggens the numbers a bit. Basically, she can provide IWS-level DPS (overall, not per shot) while maintaining her high (for an FP rifle) RoF, making her very efficient. Generally rated "probably 1 of the best mods to work on after you're done modding AR team" by older servers.

She has very weird mechanics. I want to say something witty but that's really how it works. The most immediately noticeable thing is that her damage is actually cut in half and she fires twice. This seems odd but no, its not just a visual thing either, and both shots actually can end up on different targets. The first shot uses normal RF targeting, while the other has real time targeting to always shoot the farthest target. Vs heavily armoured (enough that AP rounds wont go all the way through) or high HP enemies, this can be bad. Or it can be excellent at trash clear.

Also note that because she shoots twice, it only takes half as many firing cycles as it says on the skill to get stacks, as she gets 2 stacks per cycle (1 per shot). It also has interactions with Sei and Jill that are in the detailed page.