>>25045467She's meant to murder spread attackers.
64+ SpA Straw Doll FutoS Hydro Pump vs. 64 HP / 64+ SpD HinaE: 307-361 (75.9 - 89.3%) -- guaranteed 2HKO
That's with a boosting mark for SpA, Straw Dolls, and hitting a weakness. And running a non-speed-boosting mark on FutoS is something I personally wouldn't do (letting stuff like AyaP and JunkoS outspeed you is not a good idea).
Meanwhile...
-1 0 Atk HinaE Venom Nova vs. 0 HP / 0 Def FutoS: 236-278 (87 - 102.5%) -- 18.8% chance to OHKO
Beware the Spin.