No, Joan Fontaine and Olivia de Havilland never reconciled. The sisters had a famously tumultuous relationship that was marred by jealousy and resentment. Their feud reached its peak in the late 1970s when de Havilland sued Fontaine for libel after she made comments about their relationship in her autobiography. The sisters did not speak for over two decades before finally reconnecting shortly before Fontaine's death in 2013.