How to help someone who won't get help

[allgoodnamestaken]

My good friend recently admitted that her mood is really low but that she's not ready to deal with it yet. She won't go to a doctor or go to counselling. She has withdrawn from a lot of her friendships. We had a few big rows as she felt that I wasn't supportive, whereas I didn't know that her mood was this way and I thought that she was withdrawing from our friendship.
I've had PND myself and also another bout of depression. She says that she supported me and that now I need to support her. The difference, I feel, is that I got help, something she won't do. So, how can I support her? I plan outings and call over/invite her over but the reality is that I can't cure it. She is hoping that the mood lifts but it has been this way for months and my own personal experience is that it has to be proactively dealt with.
I'm not sure if I'm judging her or if I'm just being pragmatic. She isn't against medication per se so I think that it is largely pride stopping her naming it as depression and taking anti-depressants.
Anyone any advice?

If you are happy to spend the money, I highly recommend buying her the book "Depressive Illness - the curse of the strong" by Tim Cantopher. It really helped me to accept I had depression when I really didn't want to. I would give it to her saying something like "I really do want to be supportive, and I hope this book may help you."

Keep sending her messages along the lines of "just wanted you to know that I'm thinking of you, and I hope you know I'm always here if you want a chat"

thanks chocolateworshipper. I've ordered the book.
did you tell friends how you were feeling? did you resent them not helping?

I probably did resent people for not knowing how to help - but you have to understand that depression affects the brain's functioning, so normal reasoning is out of the window. That's why it is such a cruel illness. I was more open about it once I'd read the book because I then understood that it wasn't something I needed to be ashamed of - a connection in my brain wasn't working properly because I had tried to be too strong for far too long. I was also then more willing to take medication - there is something in the book along the lines of "if your kidneys weren't working and you needed to take tablets to fix it, you would. So why don't you want to take tablets to make your brain function better?" It's been many, many years since I read it - but those were the 2 main messages I got from it.
The most amazing thing anyone did for me was when I phoned a colleague at work (who had an incredibly stressful job) and sobbed down the phone to her. She said "give me your address, I'm coming to see you now" - I was an hour away from her. She would have worked very late into the evening to make up for the time she took out of her day to help me. It's important to try and be there for her when she needs you - and if it requires a sacrifice that you are willing and able to make for her - she will hopefully appreciate it.