What do the opening stage directions in Scene Nine suggest about Blanche's state of mind?

The scene's opening directions opening directions suggest that Blanche is alone, drunk, and reliving the past.... a not so happy memory.

-Blanche is seated in a tense hunched position in a bedroom chair that she has re-covered with diagonal green-and-white stripes. She has on her scarlet satin robe. On the table beside chair is a bottle of liquor and a glass. The rapid, feverish polka tune, the "Varsouviana," is heard. The music is in her mind; she is drinking to escape it and the sense of disaster closing in on her, and she seems to whisper the words of the song.