<human>: Can you give me the gist of the text in a nutshell?

My girlfriend (18 F) and I (18 M) have been together for about a year now, we started dating about half way through senior year of high school.  When we started dating, I wasn't aware that she had depression, but I figured it out pretty quickly.  That said, it was really no big deal while I was there, I was able to help her through the hard times, and we got to enjoy the good times.  Since then, however, we've gone our separate ways for college, but we decided to try going long distance.  We talk all the time, try to skype at least a few times a week, but are otherwise always texting.

The problem is, when she is having a bad night/day/week I'm at a complete loss for what to do.  I try to help, try to talk to her, try to distract her, but nothing seems to work, and she seems to shut me down no matter what I do.  I still love her, so so much, but when she's really down, idk, it seems like she turns into a different person, and not the person I fell in love with.

There have been a few times over the course of the school year where we'll be in a skype call, and she'll be sobbing, and I'll just be sitting there like a fucking idiot.  There has to be something I can do to help, isn't there?  I guess the point of this post, other than just getting all that off my chest, is to ask just that.  What can I do to help her through the bad times?  Especially looking for advice from anybody who's made long distance work, but if anybody who has experience dealing with others who have depression sees this, I'm all ears.  I should note that I'm a very technically minded person, so all this emotional stuff is pretty difficult for me, so please don't be too hard on me.
<bot>: My girlfriend has depression, and I don't know how to help because we're long distance, so I'm looking for advice.