Tamasha - Imtiaz Ali had approached Anushka for Deepika's role but apparently she turned him down because she was rejected for a movie by him in the past.
Ki and Ka - Script for this movie was written keeping in mind Kareena as the lead. However, the makers were not sure if Kareena would accept the role, so they approached Anushka for the role first but she turned it down.
Baar Baar Dekho - Farhan Akhtar offered Anushka a chance to work in his upcoming movie but she couldn't take it, so, this role eventually went to Katrina Kaif.
2 States - This movie did quite well at the box office. Anushka was offered the role of Alia and she even read the script but finally rejected the offer.