A Sad Day

Its a sad day for me today. My baby girl moved out last night, which in itself is a tragic thing for me since I am majorly going through some empty next issues. But she moved out because she is mad at me and hasn't talked to me in 5 days except to yell at me to get out. I realize that everyone's reality is their own and what I may think about the situation is not at all how she feels, but I can't help but think and worry that its just not worth getting that mad at someone over something that in the big scheme of things just really isn't that important. Now I will say, that I'm not really sure what she's entirely upset about, but if it is only what she's letting on, then its really not that important. I have seen too many times in the recent past that a life can be changed or be gone in the blink of an eye. Do you really want to waste your time and energy being mad at someone that you're supposed to love.
I'm just sad, really really sad. And I don't know what to do. Normally its best just to let her get over it, then you can talk to her. But there doesn't seem to be any move toward getting over it. I'm torn between leaving her alone to get over it and begging and crying for her to forgive whatever I've done and come home. I have missed out on so much with her already with her living with her dad for several years, but I really miss her now. I can't help but think that I've failed her, I didn't somehow give her what she needed, I didn't love her enough or at least didn't make sure that she knew I did. I just don't even know. I'm just sad.