Hi, Laurie. Welcome. Well for starters, your partner can take the free online test (see Tools at the left of the page.) The test results can be printed out for her to take to the doctor on her first visit.
If she has suffered a recent loss of any kind, she is likely going through the stages of grieving, and depending on how great the impact was of the events, may perhaps find grief counselling quite helpful.
If on the other hand the events were not of that nature, then being there to listen to her is important. There are some posts on negative thinking in that forum which may help you, if she is digging herself deeper and deeper into a depressive state.
Reassuring her and showing her that she's loved is important. You seem to care a lot for her and it's important for her at this time, I'm certain.
Hope this helps a little.