These people are selected in the systems analysis group because each has his/her own expertise which can help accomplish goal.
Yes, Nancy did not handle things well. The reason being: Agenda of the meeting should be cleared at the start. She did some right things, like listening to everyone and not telling everyone that Maria had lied. She adjourned the meeting too quickly and apologized for being a newbie was wrong.
The meeting should have been structured in such a way that everyone should have been briefed in the start why the meeting had been called. Introduction of ...