Does this mean she's not interested?

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So this girl I like who I think likes me back has started the conversation 3 times with me, but after I reply, she doesn't reply back after that. I did reply a couple of hours after each one as I didn't see them until later, but when I do reply, she doesn't continue the coversation. She also deleted the two messages sent in our Twitter conversation via DM a week after the conversation. I don't know if she's just shy or simply can't be bothered. Thanks for helping if you do