What to say when she says let's keep chatting and see where things go

This line is almost always a positive signal, but a mild one. She has decided the conversation is worth continuing and does not want to rush it. What it does not tell you is how fast she wants to move, whether she is talking to other people, or whether she is hoping you will suggest something specific. Her message leaves the ball in your court on purpose, so the most useful thing you can do is look at the energy of the rest of her messages. Does she ask you questions back? Does she pick up threads you raised? If yes, the phrase is sincere and you can keep building. If her replies have been short and she is closing topics, the phrase is more of a polite way of slowing things down, and you should match that lower energy rather than pushing harder.

The fastest way to make "see where things go" go somewhere is to attach a light, specific hook to your reply. Something tied to a detail from earlier in the conversation, or a question with a clear answer, works better than a general statement of agreement. Keep it low stakes. A question about a show she mentioned, a place she said she wants to visit, or a plan for her weekend gives her an easy opening and shows you were paying attention. Avoid stacking two or three questions at once, because that turns a relaxed exchange into an interview. One thread at a time keeps the momentum natural and lets her decide how much to invest in replying.

If she does not reply, the question is how long to wait and what to do next. A reasonable window is a day or two if the conversation was active, and longer if she had already slowed down before this message. One follow-up is fine, ideally tied to something new rather than a plain "hey, you there?" Make it light and give her an easy way to respond. If that gets nothing, leave it. Sending a third or fourth message reads as chasing, and it tends to kill whatever interest was there. If she comes back after a gap, match the warmth she shows rather than trying to make up for the silence with extra enthusiasm. Stop when the thread stops moving, and pick it up later only if something real gives you a reason to.