Creeper,
Sorry that she seems to have put an abrubt stop to your long relationship. One thing I have learned is you can never try to figure out what someone else is feeling or going thru. When we start to disect those situations our minds lead us down all sorts of paths. Some good and some bad, but probably the wrong path. She has her feelings and her issues, hey, we all have our issues. You said that she is dealing with depresssion, there really isnt a cure-all for that disease, you learn to deal and cope with it over time and manage your feelings better. So sadly that will be a part of her life for as long as you know her, its just how she chooses to handle it. You mentioned that you were going to see someone about being ADHD, good for you for stepping up and trying to get help.
The one thing that stood out to me was that she asked for a break. I know its a tough pill to swallow and no one likes being "rejected" by someone they put almost 7 years of their life into cannot be easy. But she wouldnt have asked for the break if didnt feel she needed it, so give her what she needs, space. I know you care about her deeply and want her to be well. But the urges you get to reach out to her, you may need to pull the reins back and give her that "space". Im just speculating, but she could read those texts or emails as a way of controling her or what ever. Where it is coming out of a place of love from you, who knows what she is reading into it. So let her do the initial communication, you can reply to her. I understand that it might be weeks or months before she reaches out to you, but if during that time she is getting help and working on getting better than thats a good thing. If she is not getting help and is staying in that same funk, you might want to cash in your chips and move on. It's obvious that you care about her deeply. If she cant see that, thats her problem, not yours.
As someone who suffers from depression, you cant be forced to get help, its something you want to do for yourself. You cant go into therapy for someone else and expect to heal yourself. You need to go for you and only you. Therapy isnt easy, you dig up a lot of past memories and while working thru things you may resent some people whom you love. But while working thru all of those issues you find that you do truly love those people.
Best thing you can do is just be their for her and focus on healing you. Because no matter what happens between the two of you, you want to be your best person for the only person that matters, YOU!
best of luck
IC