Eh, her main complaint is that the Absolute forced her to do it. She doesn't really have any qualms about performing evil provided her goals merit it. When she asks you why you slaughtered the Grove, the only answer she seriously objects to is the one saying you did it for the lulz. But every reason that was goal related gets either her mechanical +approval or "Heh, yeah..."
I liked my run with Minthara but she's evil. She says some hilariously eff'd up stuff in Act III. Also...
Spoiler: Minor Spoiler
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For all that she resents being controlled, once we discovered the whole plot, she was "So, we're gonna dominate the brain instead, right? And rule as dictators? 'Cause that's 100% what we should be doing."
SHE doesn't like being dominated but she's all on board with ruling as God-Queen and dominating everyone else. She doesn't even have Gale's pseudo-religious philosophic reasons for why him keeping the Crown might be warranted or Astarion's "After centuries of pain, no one will ever hurt or scare me again" reasons for wanting to hijack the ritual. She's just "This is a great way to become rulers and we should be doing this because, you know, we'd be rulers, duh."
She doesn't sit around laughing manically while eating a bag of orphan kittens (that's Orin's job) but she's well south of the Neutral line. Which I actually appreciated.