Maybe you need more practice before showing others. It looks like you were having a little trouble. Plus, how long will the glue hold. I think it will come apart in no time. A waste of time.
The title said she made 250 of these flowers in one day, so I think she has had plenty of practice. So she used a dab of glue to fasten the flower to the barrette. You don't have to use glue, sew it on if you want to. It takes a very unappreciative person to discourage another when all they are trying to do is share something they love making. I am a professional artist with love for all things crafty. I happen to like this video very much.