Because she became toxic. It can happen - when one's relationship with mgmt turns sour, sometimes that one person can become really negative. A respected, "star

Because she became toxic. It can happen - when one's relationship with mgmt turns sour, sometimes that one person can become really negative. A respected, "star employee" that turns sour can really destroy morale in entire departments if given time to do so. Yes, she can complain on Twitter and still do some harm; but without her, management at least has a chance to control the internal conversation.