What should I text a girl who isn't replying?

Before you write anything, look at what she sent last. A short "lol yeah" after a long message from you usually means she was half paying attention and the thread just ran out of steam. A question she left unanswered tells you something different, since she may not have known how to answer it. If she was the one who ended on a question, the silence is more likely a timing issue. If you ended on a question, the silence is more often a thread that stopped giving her a reason to care.

Also check how long it's been and what she was like before the quiet started. A girl who was replying within minutes and then goes dark for a day is probably busy. A girl who was already sending one-word answers is showing you her level of interest. Read the pattern, not just the gap.

The message that works here leaves the conversation open without asking her to justify the gap. Two kinds fit well. The first is a light callback: refer to something specific she said earlier and add a small new thought, so she has something concrete to react to without having to restart the topic. Its job is to make replying feel easy. A good draft is short, names one detail from the conversation, and ends on something simple to answer.

The second is a plain, low-pressure check-in that gives her an easy out, like a yes or no question or a choice between two options. Its job is to let her respond without feeling cornered. Leave out anything that mentions the silence, asks if she's mad, or sounds like you're keeping score. Don't send a message that's mostly about how you feel being ignored. That turns the reply into your reaction instead of something about her.

Send your follow-up when a normal person would be checking their phone, usually late morning or early evening on a weekday. A message at 2am reads as either desperate or as a late-night move, and both lower the odds she answers warmly. If the first follow-up goes unanswered, wait at least a day, often two or three, before sending anything else. A second message in the same afternoon is a chase, not a follow-up.

If you get no answer after one solid follow-up and one patient second attempt, stop. Leave the thread alone and let her come back if she wants to. If she does reply later, match her energy and don't bring up the gap. If she never replies, you have your answer, and the most useful next move is to start talking to someone else.