M.K.
when my mother had ovarian cancer, she shaved her head, my sister did it for her and i have to say it upset my sister a lot.
my mother was not bothered too much by being bald - she wore scarves and wigs and tried to look on the bright side.
with her second dose of chemo she decided not to shave her head, and this time although she lost a lot of hair, she still retained enough to look "normal"
i would say maybe hold off this time and see how much hair comes out.
im sure it would mean a lot to her if you would help her with it if you notice that her hair is looking to thin