On one hand, she's actually not bad, being a flashbang unit with a solid backup skill (If it's vs. a boss, she becomes a shielder tank instead with some minor evasion buffs) that also helps kill mooks faster. On the other hand, she has a mod3's price tag and opportunity cost, at a time when there's lots of nice mods running around.

If you already have a nice set of mod3 dolls, go ahead. If not, consider saving it for later.

...Oh, and you can save yourself the trouble of getting her mod equip. It's kinda pointless on a tank.

Her previous iteration can be found here

It's a shame she has voice lines now, since the best part about her mod was shutting up her annoying voice. But alas, you'll probably be hearing it, because unlike her basically not-worth-the-effort base form, this one is actually decent. The big change is the six second ICD, which lets her fire grenades within the lifetime of many fights in a meaningful way, unlike most other grenadiers.

This ironically makes her useless for Chapter 11 farming, but thankfully she's good for Chapter 12 farming.

The grenade itself is buffed somewhat, and the ICD also makes her a bit more stable than SOP for some fights (SOP retains the problem of "You need the enemy to still be worth hitting with grenades 8 seconds in"). Overall, decent grenadier that you'll likely use a fair bit for farming and events, helped by 416 playing a big role in a lot of event maps and thus getting stat buffed.

Oh, and get her equip when you can. it isn't stellar, but it beats the hell out of a frame that doesn't contribute to DPS.

i can't believe her fucking name is clukay

Her previous iteration can be found at this page

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.