She attended Parkville High School and received a diploma in nursing from St. Agnes Hospital in 1970.
[1] Around 1970, Felling started working as a public health nurse in Baltimore County.
[3][4] Felling was defeated in her bid for re-election for the District 8 seat in the Maryland House of Delegates in 1990.
In 1994, Felling ran against incumbent Thomas L. Bromwell for the Democratic nomination in the Maryland Senate, but was defeated.
[5][6][7] In 2002, Felling ran for a District 7 seat in the Maryland House of Delegates, but lost in the general election.