She was despairing that it wouldn't grow back. In her situation, she had one chemo treatment and her hair started falling out almost two weeks to the day, then she had an accident and the chemo was delayed, during the time she grew a full head of hair back, then she had three chemo treatments in relatively quick succession which seemed to kill off all her hair follicles. It didn't grow, then it was patchy and almost "hesitant". My theory is not all the follicles come back to life simultaneously which is why it takes so long.
Finally, after just ignoring her hair for months and wearing hats, she grew it all back and it became an "old white lady 'fro". I had to convince her to condition it thoroughly so I could stop calling her Eraserhead.

(not my mom, but similar hair)
I don't know if this helps, or how much your heredity will affect it except to suggest that it might just take a good long while for your hair to recover from all the chemicals your body has been experiencing.
One lady during chemo suggested that the hair that grows back is "completely new" since the old follicles die off and recycle, and the pores contract, giving you new baby-fine hair at first until hair production gets going and the hair shafts thicken. Sort of like when an adolescent first grows thin patchy beard hair that eventually becomes coarser.
Some extra nutrition could also help:
http://stylecaster.com/beauty/make-hair-grow-faster-foods/
(They recommend eating salmon, yellow peppers, oysters, egg yolks, sunflower seeds, sweet potato, avocado and almonds to boost your levels of Vitamins C, D, E, Omega-3s, protein, zinc, and beta carotene to support hair growth. Apparently, a mixture of avocado and sour cream can be used as a 10-minute topical scalp application to stimulate collagen. I also bet the extra would make a great chip dip!!)
Good luck and health!