Possible Clues:

• 'Downton Abbey' star
• ''Downton Abbey'' grandmother
• Supporting Actress (''California Suite'')
• She played Professor McGonagall
• She has two Emmys for playing Violet Crawley, Dowager Countess of Grantham
• Acting may be the HAMMIEST GIG, but not when she does it
• Best Actress of 1969