What to message a girl who ghosted you?

Before you write anything, look at how long she has been quiet and how the thread ended. If she stopped right after a plan got set, she may have been warming up to you and then got cold, or she may simply have been hit by a busy week. If the thread faded out from both sides over several days, the silence is mutual and a message will mostly confirm what already happened.

Check whether she actually left a door open. A question she never answered, a plan she never confirmed, or a joke she didn't follow up on all tell you something. A thread where she was sending messages in full sentences and then went blank is different from one where her replies were getting shorter for a while. The shape of the drop tells you how much to expect back.

The message should be light enough that she can reply in one line without feeling like she owes you an explanation. Something that refers to the last real thing you talked about tends to work better than a generic check-in, because it gives her a concrete hook. Keep the tone even. You are not annoyed and you are not apologizing for anything.

A draft is the right shape when it is short, refers to something specific, and ends without a demand. It should leave out any question about why she went quiet, any guilt-trip, and any sentence that says you are checking in because you have not heard back. If the draft reads like you are waiting for permission to feel okay, cut it down until it is just a normal message from someone who is not stressed about the reply.

The time you send matters almost as much as the words. A message sent late at night can read as needy, even if it is perfectly friendly. Send it at a normal time, in the middle of the day or early evening, when it looks like you were going about your life and happened to think of her.

After one message, give it at least several days before you try again. If she answers, match her pace and length rather than jumping straight back into the warmth you had before. If she doesn't answer, leave it there. One follow-up at most, sent a week or two later with a different, equally light angle, is reasonable. After that the thread is done, and continuing to message will only make you look stuck on something that has already ended.