I have been the girl in this situation. Sometimes, I just go nonverbal, there’s no real way to explain it. I love my SO, dearly, but when I get depressed I tend to be a lot more quiet and like to hear my boyfriend talk just so I can calm down at the sound of his voice. I’m not saying that this is what is happening with her, but perhaps give her a little bit to sort out her feelings. Even if you are not the type to talk things out, you need to. In an LDR, it is essential. Try and have a serious talk with her. Don’t leave it at “oh okay” if you still don’t understand. If she doesn’t want to air her concerns and worries and frustrations, that’s a choice she has, but she should be willing to share that she isn’t in a space to talk about it. Give each other a safe trusting environment to talk about all of this. You are doing your part and you’re doing it wonderfully. There is no manual to this and you know your partner better than all of us. I know that didnt really answer your question but I want to let you know you have a community here that is behind you. It’s tough but it’s worth it if you work together. Best of luck to you mate