J.,
I grew up with a dad and brother who are both bipolar. Growing up it was hard, my dad didn't know he was for the longest time and it was hard on us kids. My older brother was also late in finding out, and now is on medication. Both my brother and dad are now on meds for this. My brother is now happily married. Bipolar is not something that should go under the radar and forgottn about, she needs to find out for sure if she has it, so someone can help her. But the point i am trying to get to is...Tell your friend just because the doctor blew her off, doesn't mean she has to stop there. Go and get second opinions, what ever it takes to get an educated answer. It is miserable not only for her, but also a stresser on the loved ones around her.
I know of a great place in town called the Women's Resource Center. They are there to help in all aspects of women's well being. They might be able to help, and if not, at least give her the names and numbers of someone who can.
I hope this helps, and feel free to write back ok! god bless, and tell your friend not to worry, everything will be ok, I'm living proof that even though it seems hard now, it does get better!