You should kill Minthara on sight. Simply make use of the Tr00 Drow dialogue options.
Agree, sort of. On the one hand, a true Lolth-sworn would kill Minthara for either/or a) being a heretic; b) being weak to let herself be tricked. On the other hand, though, by then the PC will know how powerful the tadpoles are and how Minthara could have been taken over against her will. The PC will, based on her mission, have a reason to ally with Minthara, once she has been returned to her senses. So I plan to act based on either path being possible and decide on the spot.