Dunham was working on Kate Winslet starrer mini-series 'Mildred Pierce' when she was let off in 2011.
"I got fired off the one day I did. Fired might be a rough word but I got sweetly dismissed," Dunham said in an interview with Grantland's Bill Simmons.
The actress played a nurse set in the period drama, but she apparently did not prepare well for the role.
"I didn't practice. I looked over the script with my mom and since the project takes place in the '30s I was like, 'Am I supposed to do any kind of accent?' My mom was like, 'They are hiring you to be you. Just go for it.'
A year later Dunham was back on top with Girls.