for the last two months a bipolar female worker who always brings her personal problems to work now has been having her current boyfriend show up for the whole day one day out of the work week and hangs around. last couple of weeks it has been two days. i'm sorry, but this is my workplace. and yet it may not interfere with me getting my work done it does make me feel uncomfortable by having a coworker bringing more her personal life physically to work on such a frequent basis.
You have recieved some sage advice from managers with experience in handling such issues. Check your policy and if it is not specifically addressed you have every right to make a report to your supervisor as it is interfering with your ability to do your work. And someone even mentioned there may be a breach of privacy depending on what her BF is privy to as he is sitting with her "all day" (how does a supervisor not see this as interference is beyond me...)
The only person out of line here is SassyLisa... and she may very well keep her illness from her work friends (which is highly commendable on her part) but she would be remiss to assume everyone does. As a manager in the Mental Health/Disabilities field, I can assure you that diagnosis are discussed openly. People outside my work who know what I do are happy to share with me their problems. (Most of the time I simply listen...or refer to a counselor). Not everyone with a diagnosis keeps it quiet... Oh, contraire...
good luck KT... hope the issue is resolved amicably