I'm not sure how to write this - I suffered PND and severe sleep deprivation when my son was about 4 months old. I even contemplated suicide - had it all organised. The first doctor I spoke to about told me to "get over it" and offered no further help. The second doctor told me "it's a normal part of motherhood" and refused medication or a mental health plan. The third doctor finally started therapy and counselling for me, and I hadn't actually gone to that appointment about my depression (DS had a cold and I was there with him).
I guess what I'm trying to say, is that sometimes it's much more difficult to get help than you would expect. Maybe your friend has already tried and been rejected. Believe me after the first two attempts at getting help, I was really doubting myself. It was a very black time.