Answer: Group-think
Explanation: Group think is the behavior of thinking in a group to make a decision on any particular subject.This method of thinking decreases the quality of decision, suppresses the opinions and thoughts of group members ,issue are ignored etc.
In accordance with question's case, Tamra thinks that decision made by her group is based on group-think The members of the group are not putting up their opinions so that dispute is not caused even though they think some of the ideas raised by Tamara are not appropriate.