I'm not a hair stylist but I second @Kami been dying my hair since I was 12 years,more than my fair share of hair colour wrongs and correcting them! If you look at a colour wheel picture, find your shade and the colour directly opposite is the colour you need to aim for and it'll counteract it :D
Hairstylist here! Be very careful with any color removers or bleach since your hair is already blonde underneath. When I do color corrections like this I counteract the unwanted tone first, then do a bleach bath to remove the pigment so in this case diluted green would counter act the pink. Sounds crazy but it works majority of the time!