So if it hasn't been said enough, absolutely get the Mod1 the very second you can. It's 200 fragments and some cores for a fair boost in performance. Extra stats, a bit more FP buff on her tiles, a little extra HP, and an improvement to the slowdown effect on the smoke.

The real problem is her 2nd skill is janky and not extremely practical. It's a little bit of a bonus, but not likely to make or break a fight. So yeah, the Mod2 isn't great. The mod 3 however, gives her a unique equipment that goes in the suppressor slot and is basically a suppressor with better stats (+5 EVA over normal) which helps her tanking ability somewhat. Whether this is worth it up to you, but definitely get the Mod1 at least.

The rest of this is basically the same song and dance where she has top class offensive buffs that continue to remain unmatched among SMGs, so you WILL likely continue to use her.

It's actually an AKS-74U, but the game calls her AK-74U. I know, I know. Yet another AR the game calls a subgun because...shut up.

Actually had dummy data in the client waaay before her actual release in CT, so she actually got released with a voice even on older servers. ...And that's probably the most positive thing I can say. Her tiles are OK, her skill is weird (she debuffs enemies she's attacking instead of just all of them) and while the effects are alright, the uptime is pretty awful for tanking.

Potentially useful for some bosses with manual skill use to handle certain burst windows, but the cooldown after the initial skill use is loooong so it's not exactly the best choice for long term tanking.

You may have a use for her if you're creative with it, but it's not something to just tell people to prioritize raising. As a result, her primary use is telling you wind speed and direction, unless you have AK-74M and want an AK echelon, in which case she'll be one of your SMG tanks and is actually pretty decent since AK-74M makes her skill into a passive.