Thanks again, Ray! DH has a Prime account; I'll ask him to look for those videos. Going through her book, though, it looks like she started to fall behind after chapter 2. That week she had a HECK of a time getting out of the orange, so I don't think she spent as much time preparing for the class. Then the third week she never made it out of the orange on the challenge problems, so I'm thinking we need to go back and shore up her understanding of the concepts in weeks 2 and 3. Unfortunately, my kid is much smarter than I am, and I am of little direct help. My neighbor (who has a PhD in Physics) has offered to help out, so I'm hoping that he will be able to give her some guidance.
Thank you again for you ideas. I really appreciate the help!