I really hope you can still romance her while in the Shar path. It seems much more interesting than yet another goodie-two-shoes redemption, but being cut off from romance because of it would suck. You can actually find info on all of SH's quests here:
https://guides4gamers.com/baldurs-gate-3/quest/daughter-of-darkness/The stuff she gets to on Shar path is wild, but romance is separate from quests, so we know nothing about that yet.
