I agree with you, the slate should not be wiped clean. I like redemption stories, but in order to be redeemed, a person has to earn it. They have to turn from their evil ways and actually do good in the world.
Just to have a better grasp of this... Of what "evil" actions she's supposed to be guilty of so far in the game, exactly?
I have no idea, maybe we'll find out. I mean, maybe she hasn't done much.
The Tieflings "she feels guilty" mind reading narrator says she has killed before and enjoyed it. It also says she has no idea what the feeling is (narrator call it guilt) and the Tielfing is the only time she feels it (but only if killed via the Goblins path, she doesn't appear to suffer guilt if you kill them for Khaga).
Going by the praises and tips she is giving the Priest of Loviathar, she has tortured people before and she's enjoying the scene a bit too much.
Post Raphael's conversation has her bring up how well versed she is in manipulation/torture and knowing people into it. You can ask her to be presented to her friends, her answer is a playful "maybe one day, but I wonder if you will survive the encounter".
Tadpole Dream conversations and her enjoying slaughtering people in them.
And now the classic Sharran tactics:
- her banters are mostly about gathering personal information. Sharrans gather information to manipulate people later. Sharran are wolf in sheep's clothing.
- Her post Raphael's conversation and putting doubts into people's mind. You only find out most of her evil inclinations if you follow more evil options and this thread is a result of people doubting she is evil...