Does she like me?

I know a girl that i had asked out. She said she would like to. Later i called and asked about a movie and she said she didn't want to go with me. She probably changed her mind because her friend kept bugging her about me and trying to prevent us from going out. Now people are asking if I still like her and she smiles a lot when i'm around her.Is this just me jumping to conclusions and nosey people or does she really like me.