She should understand parliamentary procedure, the role of the chairperson, and the purpose and design of an effective agenda. In addition, an awareness of the subject that the group is involved with is important. If you are a director of the Widget Association, you should know a little bit about widgets. We tend to think of a good communicator as a good speaker. This is only partly true.
Good communicators can express themselves clearly and with confidence.
A good listener hears not only facts but also feelings. Paraphrasing or restating the person's message in shorter terms is a useful technique. It helps to clarify the message, and it shows the speaker that you have heard what they have said. A leader cannot achieve success alone. An effective leader is involved and in touch with group members.