> Fatigue can go well beyond 200. Of course, units start taking damage, but fatigue is not *converted* to damage.
Are you playing another version of dom3 ?
Fat is converted to dmg and never exceeds 200. Each turn a unit lose 5 fat, and with reinvig 5 that puts you at 190.
Use something that hits her automatically. Give her a curse and a horror mark. Petrify her. Tangle Vine her. Earth Grip her.
There is plenty you can do.