What we know:
She has been diagnosed with early onset Alzheimer's and is living in a nursing home.
She is Meredith's mom.
Two time Harper Avery Award winner.
Tried to kill herself by slitting her wrists when Richard Webber left her.

Key episodes:
Died in episode 3.19 from lung cancer


Medical specialty:
She was one of the country's most excellent surgeon.

Relationship roller coaster:
She was married to Thatcher Grey but left him after having an affair with Richard Webber.

Current crush:
Burke, she thinks when she is not lucid.

Secret?
Her secret was that she has Alzheimer's, but everybody now knows.
Had a secret affair with Richard Webber when she was an intern.
Kept diaries which were discovered after she died in Season 5

Defining moments:
When she met Meredith in the afterlife and told her "you're anything but ordinary, Meredith." and then told her to run!

Characteristic quotes:
"You're anything but ordinary, Meredith."