If you are an ordinary friend between a stranger and someone who is a little familiar, it is impolite not to reply to the message. If the number of replies is small, such as "hmm", "yes" and "yes", it is only a reply to the information received, and there is no intention to continue the topic. It usually implies that she doesn't want to continue chatting. Please don't continue sending messages. Maybe it's because she's busy and you disturb her. Maybe you haven't reached a relationship where she can talk to you.