It would probably also be a good idea when encouraging her to see a doctor, to point out that because she has had a whole series of stressors in a short period, she is a prime candidate for depression, and that it is particularly important now for her to stay well and on top of things, so that she can demonstrate that she is a suitable parent and the father can't exploit any weakness or instability that she might show if she is too distraught. So having a doctor prescribe something mild to help her cope might be a good thing.

Therapy and talking is also going to help her a lot, and it sounds like you are doing the right thing as a good friend. Make sure this doesn't drain you too much also. Why don't you distract her with shopping, or a movie, or anything else you think she might have fun with? It would give you both a break.