Continuity complications: Vala and more

After watching The Quest, part 2 and Line in the Sand, I find myself very, very frustrated with the subject of Vala. No real spoilers for those two episodes ahead, but please be careful anyway.

( My problem with Vala and other continuity )

As I say on my profile page, I don't much care for these last two seasons, but I'm willing to keep an open mind. And I've been trying. But it doesn't seem to be working very well.

I want to enjoy this last half of the season. And the Vala of now is someone I could like, if her backstory wasn’t such a sickening one. So does anyone have any suggestions for a truly realistic way to marry S8-9 Vala with S10 Vala so that I can just accept her presence and move forward?