system
Given the following post, respond as if you're commenting on Reddit:
human
How should I handle a fellow student that is hijacking our lab meetings?

My five fellow students in marketing and I have a lab meeting with our advisor every two weeks in which we discuss papers in our field. I love our meetings because they have very high quality discussions and i want to keep it that way. 

Our department is mixed with several other business related fields, including management info systems, which is different in terms of theory, methods, and journals. One of the MIS students, X, in the department has a project that she wants to be more marketing-related, although it absolutely is not. She has been asking our advisor for his advice and he graciously did. However, ever since this started a year ago,  X has become a complete nuisance. Examples: she asks our RA to design her studies for her (phd students should do this themselves) and takes up at least four hours of meeting time with advisor every week whereas the more junior students get far less (X has two advisors of her own in her own field, and our advisor has four students himself). This was not my problem so i let things be. 

Now, however, she has started attending our lab meetings, which does affect me directly. Im ok with 'outsiders' attending, but only if they keep the discussion within the field. X is not doing this by consistently asking unrelated questions, refuses to alter her way of thinking, refuses to acknowledge other viewpoints, and talks over others. As a result, the quality of the discussion has plummeted. 

I am the most senior student in the group, so I have something to say about what happens in these meetings if it really affects the group. I do not think our advisor can / will do anything about this (he is working with her so competing interests). He is also very polite and sincerely wants to help those that ask for his help, and she capitalises on this. 

I am not afraid of confrontation and plan to confront X directly, but i want to come up with a smart strategy that involves not burning bridges with advisor or anyone else except X. What can i do to make this situation better?
gpt
Write and circulate an agenda for each meeting. This should include a timeline for each topic. Appoint a firm but fair chairman (yourself) to regulate the discussion according to what is on the agenda.