She reads your texts but posts on Instagram: what it means

A read receipt tells you the message was opened. It does not tell you she thought about it. Plenty of people open a text while they are in a queue or half-watching something, and then forget it. Instagram is the same. Stories and feed scrolling are the lowest-effort things a phone does, and she can be on them for twenty minutes without ever opening a chat thread that needs a real answer.

So when you see both at once, read it as: she saw this, did not have a reply ready, and her attention went elsewhere. That is a weak signal of interest or disinterest. What would strengthen it is her own initiative over time, like her replying to a story of yours, asking you something, or picking up the thread on her own. Watch for that rather than the timestamps.

The reason people leave messages on read is often that the reply would take effort and the moment passed. So the thing to do is lower the cost. A message with one clear, easy thing to respond to (a question with a simple answer, a small observation she can agree or disagree with, or a funny detail from the situation you were texting about) can be answered in five seconds on the bus. A message that opens three topics or asks for her opinion on something big is harder to answer and easier to skip.

Also drop the scoreboard. If your message is about the conversation you think you are having instead of something happening in her day, it reads as pressure even when it is friendly. Keep the reply light, tie it to something real, and let it stand on its own without asking her to justify the silence.

Timing matters more here than people expect. A message sent late at night, or during the window when she is most likely to be out, usually sits untouched. Try to send when she is likely to be free and not in the middle of something: a weekday lunch or early evening tends to work better than late at night. Then wait at least a day or two before saying anything else, and give the next message a different reason to exist rather than a reminder that she has not replied.

If there is still nothing after one follow-up across several days, stop chasing for a while. Leave her Instagram alone, do not reply to posts to get attention, and let the thread rest. If she comes back on her own, that is a real answer. If she does not, the silence has told you the level of interest, and continuing to send messages only makes the next conversation harder to start.