It may be that you're in a rural area far from any cell towers, there could be no SIM card in the phone, or you could have a SIM card in it that doesn't have active service from a provider.
I'd recommend you get to know her better. But before that, get to know yourself. You have to understand what she meant by "emotional" and "moody. For example, it might...
Restart Steam. It happens to other people often too. If you just log out quickly or just exit the app, then it will most likely say you are back online...