What does Willy Rusell indicate that time has passed between the end of Act 1 and the beginning of Act 2?

The way she dresses ,her attitudes towards Frank and the lessons too are some changes that we have the opportunity to see during these acts.She changes her attitudes towards Frank because she can answer Frank in a different way.She feels more confident,she thinks being there make her improve her process of learning poetry.She also learns more about the world that she was trying to understand better at the beginning of the Act 1.Rita hasn't exactly changed but she is just 'acting' as if she had changed, I mean, she wants to show that having been to Summer School has influenced her not only in her wanting to dress up but also in her wanting to be called 'the new educated Rita.' She wants to be compared with the 'proper students' she has mentioned previously in the play.the fact that Rita read books and learned a lot about writers means that she is now 'well-read' but, unfortunately, this being 'well-read' can sometimes be confused with being educated and that is exactly what happened to Rita: by this moment in the play she thinks that her being well-read and her having increased her knowledge about literature mean that she is now educated.