One thing you could try, that I have heard works for some people, is to misdirect her a little bit. Although I wouldn't advise having a general practitioner or a family doctor as her main source of treatment if a psychiatrist or psychologist is an option, a general practitioner can be a good place to start. Instead of telling her she needs to see a doctor for a mental illness, you could suggest going into see the family doctor to see if maybe she has a thyroid or a hormonal imbalance that is causing her moodiness. She said to you before after an outburst she was just feeling angry, and paired with the crying at work, you could say you think she may have a thyroid problem or something similar. Then go with her to the doctor and you can express your concerns as well, because it very well could be a type of thyroid problem, and wouldn't hurt to get that checked as well. I wouldn't just come out and tell the doctor you think she has bp, but you could describe what her moodiness and stuff looks like from your perspective. At least then you get your foot in the door, and more importantly, you get her foot in the door.