How to bring up that she's vague about what she wants from this

One soft answer means very little. A pattern means a lot. Look at whether she accepts plans and then cancels, whether she answers the big questions with "we'll see" while still being warm about the small ones, and whether the gap between replies grows when you get near the topic of the future. If she's keen on what's happening now and goes quiet about what comes next, she's probably telling you she's living in the present on purpose. People who are sure they want something usually say so, even when they're nervous.

Also check your own read. If you've already decided you want something exclusive, every noncommittal line will feel like a door closing. Ask yourself whether she's actually holding back or whether she just hasn't thought about it the way you have. Both are possible, and they need different responses. Someone who hasn't thought about it needs room to think. Someone who is holding back needs to be asked more directly.

People answer clearly more often when they don't have to guess what the other person hopes for. If you open with "so what are we doing?" she has to work out what you want, then decide whether she wants the same thing, all in one text. That's a lot. If you say "I'm starting to want something more consistent and I'd like to know if that's on your mind too," she has a clear target. You've named your side first, so she can answer without feeling cornered.

Keep your statement short and free of pressure. Don't list every hope you have for the next six months. One sentence about what you want, one question for her, then stop. If you pile on conditions or explain why you deserve clarity, the message becomes a negotiation, and she'll respond to the negotiation instead of the question.

Some people really don't know yet, and pushing for a yes or no just gets you a rushed answer they'll regret. Make room for "not sure yet" without treating it as a rejection. Tell her you're fine with her taking time to figure it out, as long as she's willing to say where she stands once she has an answer. That gives her permission to be honest and gives you a timeline to plan around.

If she still won't say anything clear after you've asked directly and kindly, that is the answer. Stop trying to decode it. You can keep seeing her casually if that's what you both want, but don't keep building plans around a future she hasn't agreed to. You can't earn clarity from her with more patience. It only comes when she makes a real choice.