What does it mean if a girl asks you to come to the cinema?

A fortnight or so this girl i like asked me if i wanted to come to then cinema with her,her sister and her sister's friend,to be honest it could mean anything i have a hunch that her friends sort of pushed her into it as they were already in town at the time. Anyway before that she asked if i wanted to go to town, and a while before that when i barley knew her, she asked if i wanted to come to arnold. I'm not good with this stuff so it seemed like a good opportunity to ask you guys!