feels like game is bugged, saveeditor states that Nell isn't upset (value is 0) but game states that she is upset. changing 1st upset value to 1 didn't change her attitude.
Perhaps another setting is off.
If you used the save editor to change it to 0, but failed to change other key settings, it may still be operating under the assumption that she is upset.
It can be a combination of settings that control how the game goes.
For instance, you change it to 0 so that she is not upset, but failed to change the setting for how you got her to go with you.