My method is described long-winded & dont know if you understand ?
When she was still bathing from her bath tub, I used a small handkerchief soaked with water, dont squeeze dry then squeeze the water from her hair then faster use hand to wipe the water away so that she can catch her breath.
My hubby started using the spray, will tell her that he is showering her from her hair, let her prepare the water from running down from her hair. I quickly take a dry handkerchief to clean the water from her face, so that the water wouldnt go into her nose, the first few times, just spray 2-3 times for that shower, teach her to blow the water from her mouth so that the water wouldnt go into her nose & her mouth at once.
When both of us are working, my mom & maid will use scoop of water to shower her, will tell her that they are showering from her hair, then maid will use her hand to wipe the water down from her face a few times then shower her body, once her body is clean, shower her hair again.
Whenever I go back home, I showered with her. But must be careful cos now she likes bathing & she fell down twice while showering with me...