Trying not to repeat other responses, some have great suggestions.
I was exactly in the state your friend is in one year ago (my daughter turned 1 last week.) While my PPD went undiagnosed for a few weeks, since it was more the manic/anxiety type instead of the stay in bed/not bonding with the baby type, I did end up on 100mg of Zoloft (safe, as far as my great doc suggested, for breastfeeding.) I was pumping since my daughter got frustrated and wouldn't latch after the 4th day - she simply wanted too much too fast. I also had to realize that she was going to be a baby on formula supplemented with one or two servings of breastmilk a day. The best was that the Pediatrician was good with this as I had difficulty juggling life, pumping for a half hour 3-4 times a day, and feeding the baby and doing everything else. By week 10, she was thriving and the doc said that unless I was getting something out of pumping that I could certainly stop (please - no breastfeeding proactive backlash here) I had trouble just getting into the shower or eating, and I had help - it had nothing to do with anything other than my PPD. I had a constant "track" in my mind that repeated and it paralyzed me at times, and at others it made me so anxious I had full blown anxiety attacks.
The things that worked best for me were (1) the high dose of antidepressant (100mg is a bit more than typical - but it was the jolt my brain needed for sure!), (2) the continued support from my parents (my Mom was with me for several weeks) who did everything from cook, clean, to laundry to make sure I actually ate - literally they had to hound me to sit down and eat - eat anything!, (3) therapy, I got a fantastic therapist who helped me realize that I was indeed going through PPD, the sessions gave me time out "in the real world" where I had to learn how to function again (I literally had trouble walking around the grocery store, I was kind of in a daze - before the meds...), (4) time out with good girlfriends - for open ended times for lunch or dinner, or strolling around, movie, etc., (5) walks outside BY MYSELF in the cool fresh winter air - having a winter baby means being stuck inside a lot and I also had a hubby who decided for us that he would do all the errands to "help out" and I resented that since it meant I was stuck inside instead, and (6) others to talk with who have gone through similar situations, even if not full PPD, just the stress and weirdness of what you go through with the hormones shifts after birth.
I hope this helps. You are in McLean, I'm in Vienna. If you want, please feel free to contact me via message. I'd be happy to be someone your friend could talk to, if she'd feel that would be helpful. No pressure, just an ear and similar experiences to share.
You asked if it will get better. The answer is yes, but you cannot see that when you're in the thick of things. You wonder if life will ever return, and in my case, I thought I'd let my daughter down before she was even a few months old :( Instead of being excited about her wonderful daily growth, I cried that I was missing her old self, (and being a photographer, I was incapable of taking pictures, so I was even more depressed since I was missing those images that I take for OTHER people with their newborns!) since she was changing so quickly. Now, I can celebrate her advances and simply remember fondly where she has been over the past year.
Best of luck, and she's very lucky to have you!!
~J