- Great-great-grandfather was former Canadian prime minister Sir John Abbott.
- Worked as a jockey at the Belmont Park racetrack in New York at age 14.
- Made her film debut alongside Burt Lancaster in the 1980 Western Cattle Annie and Little Britches.
- Nominated for two Tony Awards in 1982 for A Taste of Honey and Agnes of God, playing pregnant woman in both shows; she won the award for the latter.
- Starred in the off-Broadway play The Two-Character Play, written by Tennessee Williams, in 2013.
- 1982, Tony — Actress (Play): Nominee
- 1992, Emmy — Outstanding Supporting Actress in a Miniseries or Special: Winner
- 1996, Emmy — Outstanding Guest Actress for a Drama Series: Winner
- 2005, Emmy — Outstanding Guest Actress in a Drama Series: Winner
- 1993, Golden Globe — Best Performance by an Actress in a Supporting Role in a Series, Miniseries or Motion Picture Made for Television: Nominee
- 1987, Tony — Actress (Play): Nominee
- 1989, Emmy — Outstanding Supporting Actress in a Drama Series: Nominee
- 1982, Tony — Actress (Featured Role--Play): Winner
- 1992, BAFTA Film Awards — Best Actress in a Supporting Role: Nominee
- Elaine Taylor — Stepmother
- Michael Learned — Godparent
- Paul Chart — Ex-significant Other
- Christopher Plummer — Father
- Tammy Grimes — Mother
- Attended Middlebury College, Middlebury, Vermont, United States
- Birth Name: Amanda Michael Plummer
- Birth Place: New York, New York, United States
- Profession: Actor
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