She's one of the dolls of all time. Yup.

AKA ST AR-15, aka Star-chan. High stats, two accessory slots, and Unique Ammo (that you need to farm for) that outperforms regular HV ammo and doesn't require forever to build up. While not considered as OP as she once was, she remains a good unit to raise; if you partially raise her, she basically hits close to RoF cap on her own.

Her mod (and her equipment set) brings her back up to a decent spot as an AR. You can see her mod here

"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.