Telfer serves on the Bend City Council, and was elected to the Oregon State Senate in the November 2008 elections, to succeed outgoing senator Ben Westlund.[1] Hers was the only seat that changed parties in the Senate in that election cycle; her campaign spent $300,000 to opponent Maren Lundgren's $12,000.[2] The shift, however, left Democrats with an 18–12 majority, allowing them to pass increases to taxes and fees without Republican support.[3] (A 1996 law requires a 3/5 supermajority in both houses of the Oregon Legislative Assembly for such measures.)
Telfer has lived in Bend since 1977.[4] She has two daughters.[4]
In 2010, Telfer filed for the special election for Oregon State Treasurer, to complete the term of Ben Westlund, who died in office,[5] but lost to Democratic incumbent Ted Wheeler in the November general election.[6]
In the Republican primary of the 2012 legislative elections, Telfer was defeated by Tim Knopp, a former state Representative and vice president of the Central Oregon Builders Association.[7]