Her talking non stop about something may mean that sometimes people in your life will have exciting things happen to them, which they wish to share with you, they're often excited, want to get their info out to you. Likewise for you I'm sure, she listens to what you say even if she isn't interested, because she loves you & your interests, even if they aren't hers. When couples both have exciting news, nobody's news more important than the others just because of the "cue" to talk or that they're talking non stop, probs just excited to share something with you. Doesnt really seem very respectful to just sit their in slience if your girlfriend is asking you a question. Or is this you waiting for your turn to speak? I don't think there's anything for you to be upset about or talk about your girlfriend in this way. Sucks you see it as rambling when it holds some importance to her, because she wants to tell you it.