Keelan is a former member of the Royal Court Young People's Theatre. She trained at Westminster College between 1998 and 1999.
Her television credits include Perfect Day, Survivors, Sorted, Moving On, The Trip, and the pilot episode of How Not to Live Your Life. She played the lead roles of Claire Ashcroft in Nathan Barley and Electroclash, aka Sarah, in No Heroics. In 2003 she appeared in an episode of Channel 4's Art Show written by Charlie Brooker.
Keelan has appeared in the films A Cock and Bull Story (2005), Pierrepoint (2005) and Hush (2009).
