A.L.
you got "hot roots" due to the heat of your scalp while processing. The answer is you will have to have it colored there, with an ASH color, because green cancels out red. It still can show some, but after a time or two, it will be unnoticable.
If you hair is blonde, than the pink color just means it hasn't processed far enough. So it would need to be processed, and then a tonor would need to be put on it.
Hope that helps.
Thanks,
A.