What to say when she says your last message was a little too confident

A 'little too confident' is a soft flag. If she had been bothered, she would probably have said something stronger or simply stopped replying. The fact that she named it and kept talking tells you she is still interested and wants to see how you handle feedback. Look at what the original message assumed. Did it assume a date, a shared plan, a decision she had not made, or a feeling she had not expressed? That assumption is what she is pointing at. Name it to yourself before you reply, because the reply should step back from that exact assumption and no further. If you can't say what you assumed, you are not ready to answer yet.

One shape is the short concession: you acknowledge the specific thing you assumed, in a few words, and move on. The job is to show you see it, nothing more. A second shape is the lighter tone: you match her mild teasing with a bit of self-deprecation, which tells her you are not offended and can laugh at yourself. The third shape is the question: you hand the decision back to her by asking what she would have preferred, or what she is up for. Each shape is recognizable because it contains one acknowledgment and one forward-facing move. Leave out any defense of the original message, any list of reasons you were excited, and any second claim about what will happen next. Those are the parts that make the reply about you again.

Send the reply, then leave it alone. If she answers warmly, mirror her energy and keep your next messages a little less certain than your first one was, so the pacing feels earned. If she answers with a short 'haha yeah', that is fine, and you should respond with something easy about a different subject. If she goes quiet, wait about a day before anything else. A second message in the same afternoon reads as anxious. If a day or two passes with nothing, one light message with a new topic is reasonable. If that also goes unanswered, stop. The correction was small, and the silence is her answer.