For the most official answer, I went to my RA (Residence Assistant) friend. Here is what the 2009-2010 RA Handbook says:
“Students are permitted to have visitors in their rooms within the following general guidelines:
- All residents and their guests are expected to adhere to Institute policies.
- A visitor is defined as any person not listed currently in Residence Life records as living in the particular area. A visitor shall not remain in the residence for more than three consecutive days per month without the knowledge and consent of the Resident Assistant or Resident Director.
- Overnight visitors are permitted with the consent of all roommates, suitemates, or apartment mates. In the case of guests who are visiting but not remaining overnight, care must be exercised to allow for the rights of all roommates, suitemates, or apartment mates to enjoy the ―privacy‖ of their shared room, suite, or apartment. Students are expected to respect the rights of their roommates, suitemates, or apartments whenever they have visitors present.
- The host resident may be subject to formal disciplinary action if the visitor’s presence interferes with the right of the host’s roommate to have access to their room or with the maintenance of their lifestyle in residence. For example, if the visitor remains as a guest in residence for an extended period of time (either intermittently or continuously); if the visitor violates Institute regulations or becomes a disturbing influence in the residence area; or if the visitor presents any health or legal problems by virtue of his or her presence.
- Any resident or residence area may lose the privilege of visitation if, in the opinion of the Dean of Students Office in consultation with the Resident Assistant and/or Residence Life, visitation becomes a detriment to the ability of a resident or group of residents to live in an atmosphere conducive to effective study.
- Violation of visitation guidelines may be referred by any member of the Institute community to Residence Life, or the Dean of Students Office. It is the responsibility of each resident to insure that both his or her rights, and the rights of others as residents in Institute housing, are upheld.”
Basically, it’s fine if she comes every other weekend… for now. Your roommate may get tired of having her there so frequently. As a friendly reminder, I would encourage you to branch out and make new friends, too.