What should I do if the girl I met on a blind date doesn't reply to the message in time, or even doesn't reply?

First of all, you should be confident, have a good attitude and don't lose heart. Maybe people have other things to answer, which is ok. As for chatting, you can talk to some parents, pay more attention to it, and let her know that you are a reliable person who can be entrusted for life, with a little humor and send text messages at different times. Maybe you will send a message in the middle of the night, which will have a different effect. People will think that you care about her and stay up all night. Say good night in the evening and invite you to dinner at noon. This is caring and considerate, and let her feel that you are good to her. Don't just send text messages, it's good to call once in a while. After all, short messages are short messages, and only words can conquer them. Don't worry, what's going on or you have to find out for yourself. Make a phone call and ask. It's hard to read a girl's mind. Dude, come on!