She is not mentally well enough to hold the position and is being put under too much pressure. As a result, she is beginning to crack up (again), and lash at those around her. The party has failed in its duty of care to her and to those around her. Shes not a nasty or unpleasant person, she is someone with stress and anxiety issues suffering. She shouldn't have been selected. You probably underestimate her issues.
I hope employees can recover and be offered another position within the party and accept that she is not well. I also hope that Allan realises that being an MP is not worth risking your health over and steps down for 2020. Then the remainder of the term would probably be lower stress.