How can one be social friends again to someone Majorly Depressed?

I'm about to speak to one of my best friends that I've been knowing since childhood tomorrow night. I have not communicated with her in over 10 yrs (we lost contact) and have known her since 1965. I have been looking for her over the internet and could not find her until FB through her daughter. Now, I am in shock. I just found out that she is suffering from major depression and have isolated herself from life. I am very saddened, scared and excited at the same time, however I don't know if she will be the "same" person. We were very best friends and laughed and talked about any and everything. We learned and explored almost everything together growing up and go way, way back. I can't imagine her in a depressed state like that now and don't know if I will know her anymore. I strongly want to help pull her out but don't know what is expected. Am I taking this too hard or do you think we can still be good friends like before. We live about 2000 miles apart and would socialize through phone or internet for now. Would I be able to bring my friend back ? Knowing her, she is scared !