Grainger was born in Manchester, United Kingdom but raised in South Africa, which she represented in the 1998 Commonwealth Games, winning 2 bronze medals.

She has represented South Africa, England and her adopted home country the United States (where she moved to when she married her now ex-husband Eddie Pohrer) in international squash.

Her 14-year squash career came to an end when the then United States number one Grainger announced she was retiring in December 2010.

Her mother was British squash champion Jean Grainger.

This biographical article relating to an American squash figure is a stub.