Seymour, a physical education teacher at Heretaunga College in Upper Hutt made her debut for the Silver Ferns in 1994.

She was again selected for the Silver Ferns the following year to compete at the 1995 Netball World Championships in Manchester, where New Zealand finished a disappointing third place.

[2] She missed selection for the Silver Ferns in 1997 and made a return to athletics that year, finishing second in the 800 m at the national track and field championships in 1998.

[1] She missed out on the 2006 Commonwealth Games team that won gold in Melbourne, but earned a callup to the Silver Ferns later that year following an injury to Casey Williams.

The Canterbury Flames played their last match of the National Bank Cup in 2007, after which the competition was retired and replaced with a new trans-Tasman league, the ANZ Championship.

At the end of the 2009 season, Seymour announced her retirement from all levels of competitive netball, pending the birth of her fourth child.