She has appeared as a guest star on many television series, including Saving Grace, Eli Stone, My Name Is Earl, Home Improvement, NYPD Blue, Married... with Children, Melrose Place, The Drew Carey Show, Step by Step, Murder, She Wrote, Friends, Millennium, Buffy the Vampire Slayer, Ally McBeal, Six Feet Under, The West Wing, Desperate Housewives, Cold Case, The Middle, Anger Management, Mom, and others.

Green appeared on Broadway in the original cast of Sweeney Todd and the 1974 revival of Candide.

[1] She performed the role of Reverend Mother in Nunsense over 1500 times and in 2002 she played Lorena Hickok in Michael John LaChiusa's musical First Lady Suite.

In 1989, Green took over the role of Miss Hannigan in a production of Annie at the Starlight Theatre in Kansas City.

[2] In 1996, she played the title role in the premiere of Claudia Allen's Hannah Free at Victory Gardens Theatre in Chicago.