MicheleKolt ... I had absolutely no problems with it bunching, gathering, or stretching etc. I think I stopped that flat with the reverse sandwich and then a good dose of 505 Spray!
It is indeed cozy, so I I think it will be perfect to keep your friend nice and warm thru the Chemo chills ... and not need a lot of strength to move it around because it is so light in weight. It'll be just like a {{{HUG}}} from you, every time she uses it.
As a hint ... if she will be taking it with her to treatments, you might want to make her a carry bag, along with some pockets to hold any other things that will be with her.