The main feature of this mod is her multi-shot AoE grenades. Think FAL, basically. Also some buffs. Acceptable performance, but expensive for what she is.

For the massive expense of bothering to Mod her and get the second skill to lvl10, you get... a weaker molotov skill than Skorpion's at lvl1. Great?

On one hand, it has the same range as the flashbang grenade. On the other hand you paid the data, exp, and core costs for a Mod. Also, the firebomb goes off the same time as a flashbang, so it's slower than normal molotovs.

Yeah, honestly I forget she even existed.

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.