No, she's beatable. You need to grapple her, then use rip bra/panties - but it isn't a guaranteed success, sometimes it takes a few attempts. I think the RNG's a bit messed up since the MZ update but it definitely works.
Yes, it used to work better on the VXA version, and I'm still figuring out what's actually wrong. The mini-update is out in a few weeks, I'll sort out some tweaks for then. Sorry about that.
