What does "Hmmm Maybe" mean from a girl?

Anonymous
I asked a girl is she wanted to go roller skating and grab a bite to eat and she said Hmm Maybe I'm supposed to go to the club.. is this a way for letting me down easy..

Note: She was supposed to go with a friend of ours from work (a girl) to the club one day she was off which was either fri or sat..
What does "Hmmm Maybe" mean from a girl?
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