As we're not her we can obviously only give you guess work. Maybe she really is depressed and when she feels better and more able to talk to folk you just aren't online. When ive been depressed before ive either stayed up really late or gone to bed really early so maybe she's doing the same thing and perhaps thats what accounts for her being online earlier than normal. I would just drop her a line saying you understand how its difficult sometimes to tell someone you don't wish to remain friends with them but that you would appreciate her telling you if anything was wrong. Put it in a way which conveys as much understanding and maturity as possible and hopefully she'll respond accordingly. She may just want a break from your friendship temporarily - when people get depressed they worry and fret over burdening their friends and so back off a bit. The bottom line is you won't really know until you ask her. And if she isn't forthcoming i would just say that you will be there to support her if she needs it (if this is what you want to do) and from there just get on with your own life as best you can. As for her getting help - you can't convince her to go to a doctor. People have to want to get better for themselves. I hope ive been helpful. All the best.