woe ‧ be ‧ gone /ˈwəʊbɪɡɒn $ ˈwoʊbɪɡɒːn, -ɡɑːn/ BrE AmE adjective literary
[ Date: 1200-1300 ; Origin: woe + begone 'affected' (from bego 'to surround, affect' (11-16 centuries) , from Old English began , from gan 'to go' ) ]
looking very sad:
her woebegone expression