She assumed the reins from the TVNZ duo of Lavina Good and Brendan Telfer, who both stood down after the completion of National Bank Cup netball in 2007.
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After the National Bank Cup was replaced by the ANZ Championship in April 2008, Foster was replaced as coach of the Christchurch-based Canterbury franchise by Helen Mahon-Stroud.
In 2004 she fell out with Netball Australia and was drafted to New Zealand playing for the Invercargill-based Southern Sting in the National Bank Cup, a team which won seven out of ten of the National Bank Cup titles (1999–2004, 2007) as a backup shooter for Donna Wilkins and Tania Dalton who later got injured.