Following Skarbø's absence due to injury in early 2009 Seth announced that she would be available to play for Arna-Bjørnar in the elite Toppserien league as the club's reserve goalkeeper to first keeper Precious Dede.

She played the full 90 minutes in the club's 3–0 win over Trondheims-Ørn on 4 July 2009 at the age of 43 years and 25 days.

A year later, on 27 June 2010, Seth was again in action in the Arna-Bjørnar goal for 20 minutes, after first-keeper Erika Skarbø was injured.

[3][4] Seth played her last Toppserien match of 2010 on 18 September 2010 at the age of 44 years and 101 days, a 4–0 win for Arna-Bjørnar over Linderud-Grei.

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