Conversation so far:
Did Janis preform at WoodStock?
Joplin appeared at Woodstock starting at approximately 2:00 a.m., on Sunday, August 17, 1969.
Was this performance a success?
Joplin was ultimately unhappy with her performance, however, and blamed Caserta.
Why did she blame Caserta for her performance?
Faced with a ten-hour wait after arriving at the backstage area, Joplin shot heroin and drank alcohol with Caserta.
What was her relationship with Caserta?
CANNOTANSWER.

Question: How did she feel about performing at WoodStock?
Self-contained rewrite: How did Janis Joplin feel about performing at WoodStock?