To Sue Or Not To Sue

So there is this situation going on w/ a friend of mine who works for a certain company. The company has going through a numbe of transitions for the past year or so since a new CEO too over the company. My friend worked for one of the three pioneers of the company. After the new CEO took over and the one of the old CEO's retired my friends boss began to have numerous problems with the new CEO till she finally retired also. The division my friend worked for then began having a series of problems as the one remaining pioneer took over the reigns. For whatever reasons, the remaining pioneer sougth to revamp the my friend's entire division. A staffing plan was devised and is in the stages of being implemented. The problem began as my friend was not allowed to directly participate in the revamping although her ideas were solicited and often implemented by the revampiong team. The remaining pioneer never sought my friend out directly and appeared to be intentionally margniZlizing my friend despite the administrative role my friend has in her division. The pioneering CEO began working direcely with my friends staff and began commnunicating with my friend indirectly almost as if she did not want to have a direct conversation with her. To further confuse the issue my friend was never directly told what her role should be during this revamping process. Yet my friend continues to have her ideas consistently challenged and she continues to receive negative feedback from the remaining pioneer. My friend did request a meeting with the remainiong pioneer but she never received a direct response from the pioneer. My friend basically does not know what her ole is and is obviously stressed out by the whole process. She feels that every action is subject to unwarranted criticism