"Are you THAT short on ARs or need cheap equipment that badly?"

You get much better ARs from story events, and there's only so much that you actually need. If you need a cheap AR and already have FNC though I guess she can be useful.

Her exclusive, while it does give her more strength, doesn't let her outperform many 4* ARs.

Choco tabemase? You get her for free and she performs OK. Has a long history of suffering in the game and may suffer from PTSD. Damage bonuses are nice, and she's just strong enough to take down a Jupiter cannon by herself, provided you have some cannon fodder between her and the Jupiter (which is mostly why she has PTSD).

She used to perform really well, and she does perform OK for cost to raise, but a 5-star and 3-star AR cost the same to actually use, and the newer ARs are much, much shinier. She's still OK but don't get too attached, you'll have better soon enough. Maybe she'll get a mod someday.