Lip Syncing

We have recorded Michaela practicing lip syncing to our chosen song Teenage Dream, we tested some shots of Michaela singing for example, a close up shot of half of Michaela's face singing. After editing the song I have discovered that we can not always edit on the beat because the shots become repetitive and confusing for the audience.
Also, we feel it will be better for Michaela to sing the actual song out loud rather than mime, as she will sing the song how Katy Perry would sing it and we found it difficult to get the lip syncing correct with the song. When we film the actual performance I think that we need to change the 'happy' emotions, as towards the end of the song the girl realises that she has imagined the relationship. I feel that the emotions need to be more angry and doubtful as she is confused.
This is the video to the Lip Syncing.