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I know - after almost six years I have found the hair and nails forum
Wonderful, Fuse, I think you'll find some useful beauty tips here.

Kitty, I have seen trays used, that the person can either, put their head against, while in a seated position, or have their hair washed while they are lying down. This way, your friend could use her usual shampoo and conditioner, and get her hair thoroughly clean.
There are some examples on this link,
here. (about half way down the page)
As I said, I have seen these trays used, and they are effective, and not too expensive. Actually, I don't know if it's the same in the US, but here we have disability equipment rental stores, where you can rent such things short term, if you don't want to buy them.