From Crawford's Wiki page:
Crawford starred as Blanche Hudson, a physically disabled woman and former A-list movie star in conflict with her psychotic sister in the highly successful thriller What Ever Happened To Baby Jane? (1962). Despite the actresses' earlier tensions, Crawford suggested Bette Davis for the role of Jane. The two stars maintained publicly that there was no feud between them. However, Crawford accused Davis of kicking her during the filming of a scene in which Jane attacks Blanche, and reportedly retaliated by wearing weights under her clothes in a scene in which Davis had to carry her.[38] The film became a huge success, recouping its losses in 11 days of nationwide release and temporarily reviving Crawford's career. Davis was nominated for an Academy Award for her performance as Jane Hudson. Crawford secretly contacted all the other Oscar nominees to tell them if they were unable to attend the ceremony, she would be happy to accept the Oscar on their behalf. Both Davis and Crawford were backstage when the absent Anne Bancroft was announced as the winner and Crawford accepted the award on her behalf. Davis claimed for the rest of her life that Crawford campaigned against her, a charge Crawford denied. That same year, Crawford starred as Lucy Harbin in William Castle's horror mystery Strait-Jacket (1964).
Aldrich cast Crawford and Davis in Hush... Hush, Sweet Charlotte (1964). After a campaign of intimidation by Davis while the film was on location in Louisiana, Crawford returned to Hollywood and entered a hospital. After a prolonged absence in which Crawford was accused of feigning illness, Aldrich was forced to replace her with Olivia de Havilland. Crawford was devastated. "I heard the news of my replacement over the radio, lying in my hospital bed," Crawford said. "I wept for 39 hours."[39] Crawford nursed grudges against Davis and Aldrich for the rest of her life, saying of Aldrich, "He is a man who loves evil, horrendous, vile things." (to which Aldrich replied, "If the shoe fits, wear it, and I am very fond of Miss Crawford.")