What does it mean for girls to send empty messages to boys?

1. It is possible that she has something, and she is very confused about how to send it to you. She wrote and deleted, and finally accidentally sent it out.

But she was embarrassed to send it again, explaining how to send you an empty message, and then she didn't send it.

Usually this will send you another one with content immediately.

You may want to test whether you care about her. If you care, you will ask her how to make time. Of course, you don't care.

If there is no message after sending an empty message, then it is the second possibility.