Is it fine to text her casually like nothing happened?

Look at the exchange before the gap, not just the last message. If she was asking you things, sharing stories, and matching your energy, a casual message will land fine even after a few days of quiet. If her replies had been getting shorter and she ended on a flat note, the quiet probably means she's cooling off, and a breezy text will feel like you skipped over that.

Pay attention to who opened the last conversation and whether she ever initiated. If she never texted first, a long silence on her end usually means she isn't chasing this, not that she's upset with you. Her initiating a question or a plan is the strongest sign she's invested, so a message that gives her a clear thing to say back is more useful than anything clever.

A casual text works best when the gap is ordinary. If the last date was a little awkward, you can usually move forward with something light that still shows you noticed how she engaged. Mentioning a specific thing she said earlier, or referencing something she was going to do, shows you were listening without making the text heavy.

If something clearly went wrong, like a comment that landed badly or a plan that fell through because of you, a completely neutral message can read as avoidance. In that case the casual reply needs one honest sentence about the last thing, or you need to address it before the small talk. Skipping it entirely and hoping it fades is the move that usually costs you the most.

A message she can respond to in one line is often the best reconnection. Questions tied to something real she told you, like how a trip went or whether she finished a project, pull her back in because she already knows the answer and wants to share it. Generic check-ins like "how's your week" are easy to ignore because they ask her to do all the work.

Avoid turning the reconnection into a test of whether she's still interested. If your message is built to get a reply rather than to be a good message on its own, she'll usually feel the pressure in it. Send something you'd be fine with if she never answered, and let the conversation find its own pace from there.