Those are all some great ideas. I know when my grandma was teaching me, she also rigged a block of wood under the presser foot, I have no idea how she did it. Practice, Practice, Practice!!! You could have her practice with scrap material sewing different items together and using various speeds until she gets the hang of it. I know I still sometimes let my foot get away from me. LOL. Hope this suggestion helps.
Practice makes perfect. By the way "Kudos" to her for the skirt...The only clothing I have attempted are doggie shirts, and they are still in the process. LOL :D