Uuuuh, I don't know. I probably should've just been vague instead of using a percentage XD; It's never said exactly how powerful she is in canon. Just that she's really powerful. >>; Just straight up half her actual power? Does that work?
I'd say around the strength of a Stage 4 boss, except that's in Touhou terms where the fandom chooses to gauge power level based on what order you fight them in, in a game (on a Scale of Stage 1 mid-boss to EX Boss basically) and I'm not sure if that'd fly with you guys (Especially since this scale isn't perfect and Yuyuko who was a Final Boss in the first game she appeared in came back later as a Stage 1 boss in Ten Desires, though it was obvious she was holding back in that fight anyway).
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I'd say around the strength of a Stage 4 boss, except that's in Touhou terms where the fandom chooses to gauge power level based on what order you fight them in, in a game (on a Scale of Stage 1 mid-boss to EX Boss basically) and I'm not sure if that'd fly with you guys (Especially since this scale isn't perfect and Yuyuko who was a Final Boss in the first game she appeared in came back later as a Stage 1 boss in Ten Desires, though it was obvious she was holding back in that fight anyway).