I sent a message to a girl, and my phone prompted me that someone (the girl) had received the message. Did she really see the message I sent?

Received the message, it does not necessarily mean that he saw the message, it depends on what software you use. If you are using some other chat software. If you send him a message, he will click to read it after receiving the message. Some software will reply to you with two small words, read. This kind of software is generally foreign. . In other words, some chat software of NetEase has this read reminder. WeChat didn't have the intention to carry the suitcase, so I don't know if he saw it or not.