She's doing all the purls on one row. I think she's having problems with how to insert the needle.
The other tutorials probably didn't mention moving the yarn because most basic stitch tutorials tell you to work the knits with the yarn in back, and the purls with the yarn in front. That's true whether you're doing the entire row with all knit or all purls, or if you're doing a row with both knits and purls on it.
sue- knitting heretic