She was a member of the House of Commons of Canada from 1993 until 2005 and, in her final term in office, represented the riding of Middlesex—Kent—Lambton for the Liberal Party.
Ur was educated at the Strathroy Middlesex General Hospital, receiving certification as a registered nurse assistant in 1964.
Ur faced a difficult re-election in the federal election of 2004, defeating Bev Shipley of the newly formed Conservative Party of Canada by only 164 votes.
Ur was one of the most socially conservative members of the Liberal caucus, strongly opposed to abortion and same-sex marriage.
She was also an opponent of the federal gun registry, and sought to eliminate the program in late 2004.