With the notion that the "they suit me" line is not necessarily definitive proof of her being the ultimate villain? And to the OP, "redemption" doesn't particularly appeal to me. Why? Because it would just hammer home the notion that the only people with good intentions are hardcore Republic Loyalists or dead. They killed off the good-intentioned Separatist, Mina Bonteri, and got her son to completely switch from Separatist to neutral to Loyalist. Barriss as the hardcore critic of the Jedi Order provides a perspective that, if not Separatist, is still sharply critical of the Republic and opposed to the Loyalists. She isn't a Krell. She isn't in this for her own skin, but for her sincere beliefs. If they return to Barriss, I hope this part of her new characterisation is retained.