On 18 December 1953, she, John Ellis and Emma-Louise Cowell were on their way to Dublin in Diane's plane, the Sky Gypsy, when it flew through the Cardiff Rift and ended up in Cardiff in 2007. Diane and Owen Harper had a relationship, but she decided to fly away and try to find the Rift again, to get back to 1953. Whether she succeeded, or if she was killed or otherwise lost in the attempt, remains unknown. (TV: Out of Time) Later, an apparition claiming to be Diane appeared to Owen after he opened the Rift. This was later revealed to have been a vision caused by Bilis Manger. (TV: End of Days)