'The 'bitterness' didn't start to get the better of her after the conference as if in a vacuum'
I know, that was the point I was making which was why I mentioned the link re CT briefing against VP at the conference - ie that was where the bitterness really took over.
All the same, however understandable, reacting with bitterness is bitterness.
'Reacting and standing up for oneself in a pugnacious way is normal and healthy'
Not of itself - depends on the reaction doesn't it? Reacting by asserting that she was attending conference on her own terms, to support the party and Cable was normal and healthy. Reacting by becoming overwhelmed by anger and vengeful feelings certainly not.