Have you already checked the two tutorials on our blog to edit hair on photoshop ?
You can find them here
I suppose you are talking about your mother,
well tell her that you can try and if she really really hates it then you can change it and go back to your old color.
Idk really what to tell you because I know how hard it is when you want something but your parents are totally against it
Have you checked on google, I’m sure some people have already given advice (like on yahoo answers)
Hum I could try but Idk if it will end up looking good