I watched only a few minutes of the video, and downloaded the pattern. I can't figure out why anyone would construct the bodice by her original method! Nor why you would attach the skirt by inserting it between the bodice and bodice lining and topstitching! I've only looked at the pattern pieces, didn't print them out, but it looks to me like the bottom of the bodice is drafted without the usual gentle curve...noticed this when she was attaching the sash piece of blue and white checked fabric...noticed it seemed to be cut straight across on both top and bottom of the piece. And... disappointed to see that she didn't either disappear the edges of the piping into nothingness at the side seam, and/or pull out a short bit of the piping cord at each end, and snip it off, to reduce bulk there. It's a shame when the teacher doesn't pay attention to these types of details, which make all the difference in the finished garment!
And personally...if I didn't have a serger, I wouldn't attach the bottom band as instructed. I would sew it single layer to the right side of the skirt, and press under the other edge's seam allowance, and the fold it up and slip stitch it...or sew right side to wrong side, fold under opposite edge's seam allowance and then edge stitch from the right side...or better yet, add a piece of corded piping here, and stitch in the ditch...one way or another, I'd enclose the raw edge if I didn't have a serger.
I'm sure she's a lovely lady, with a great sense of style and colour, but I'm disappointed... I have other dress patterns I will use instead of this one!