I want her, but I don't have the foundation yet to bring her into my life. No blow off, just the truth.?

Alright, I dated a girl for a while, about two months. And before that we had a lot of correspondence on the internet. It was great all around. But then she left to go take cles over seas. She did that and it's been about 2 years since she left. Then suddenly, I get a correspondence message from her on the internet basically saying - hey hows it been going? Also that she's coming back to the states - I know then isn't her saying - hey let's date again - but it is a door opener. And I would be all cool for that except I feel uneasy about my own situation. In that 2 years time a lot of crap went down in my own life. My friendships had shakeups, and I had to drop some less than savory characters from my own life. After all that I'm still trying to make new friends, get a job, and for personal reasons it is taking me a long time to nail down my own foundation again. But so in effect my own life is still in disarray, and I feel like that's not something I want to involve her in, until I get my crap together. But she said she's coming back in August, and so I'm wondering should I reply to her message and open that door, or should I keep it closed because I know the conditions aren't right for any of that yet? It's just, in the meantime between me fixing my crap and eventually talking with her, she could do the proverbial slipping through my fingers and you know what I mean.