During the ANZ Championship era, Halpenny played for Canterbury Tactix and Waikato Bay of Plenty Magic.

[1] In 2008, Halpenny was a prominent member of the Villa Maria team that won the South Island secondary schools netball tournament.

[4][5][6] At the age of 14, Halpenny, along with Julianna Naoupu, was drafted by Margaret Foster into the Canterbury Flames training squad.

[7][8] While playing for Tactix, Halpenny also represented Canterbury in the national provincial netball championship, helping them win titles in 2010 and 2011.

Together with Carla Borrego, Althea Byfield, Claire Brownie and Caroline O'Hanlon, she became a member of the inaugural Sirens squad.

[39][44][45] In November 2014, Halpenny was a member of the New Zealand team that won the gold medal at the 2014 Fast5 Netball World Series.

In the final against Australia, during the second quarter, she scored with a huge shot, worth three points, from 10 metres on the buzzer.

[46][47] In January 2015, Halpenny was a member of the New Zealand team that won the Oceania Netball Series, playing in matches against Fiji and Samoa.

[52][53] While playing for Southern Steel, Halpenny also served as a full-time New Zealand Police officer, based out of Tokoroa.