I completely agree that actual endings are very emotional. But as we all said 1000 times before, the possibility to save her especially with all clues in act 3 should be possible for sure. If you romance her or at least care about her and complete her quest, you should be able to save her and stay in Faerun (this is what isn't possible). If you don't complete her quest (which is now marked as completed, but it is not true), you or Wyll or all three can go to Avernus, or you can let her die in peace. And if you don't care at all, you can let her die alone without noticing.
So what we all here are missing is the not implemented (removed) possibility to fix her engine.
