Moving in can be a huge milestone in anyone's relationship evolution.
Can you elaborate on what she said she meant be ‘It is her'?
If that was just a brief comment she made then it's time you need to continue to discover what it is that has her troubled, concerned or whatever else it might be (which could be any one of a thousand things).
You might want to read one of our posts on Being Empathic when talking to your lady. And you also need to shelve your own frustrations. Working on understanding your girlfriend and getting balance back in that side of your relationship will go towards getting you what you need.
Please do comment back with more details though. There's obviously more to it.