I could not figure out a way to extract a pdf of the textbook to send to her kindle. I would have liked that solution, since she has one of the large format kindles.
I was not able to extract the PDF from the online textbook. I think I had something that would have worked to just get the content, but I'd have had to stitch all the chapters back together, and if the page numbers didn't match the original book it would have been a hassle for my daughter.