Just a head's up: I made two corrections to Yukari's data on the character wiki.
First is that her second spell hits DEF, not MND.
Second is that Buddha's Stone Bowl still works on her after Spiriting Away. However, Spiriting Away raises Kaguya's bar to 12,000 rather than 10,000 like every other character, so she'll always act next. If she casts Buddha's Stone Bowl on Yukari, that sets her bar to 11,000, which means she gets to go again before the other two characters have even used their extra turns. That's why the infinite turns combo doesn't work...unless you want to buff Yukari. If you've got a few thousand SP to spare, you can keep casting Spiriting Away and Buddha's Stone Bowl over and over to buff Yukari to 100% in all stats. Not sure why you'd want to do that, though. Maybe if your remaining 2 members where Ran and Chen, I guess?