The 25-year-old travelled to Norway to witness the Northern Lights, which she says her mother loved.
"My momby had an otherworldly obsession with the northern lights, but I never got to see them with her," Billie captioned her images of the phenomenon. "We journeyed to northern Norway to see if we might 'see the heavens lift up her dark skirts and flash her dazzling privates across [our] unworthy irises.' And she did."
She added, "I love you times infinity."
Her Star Wars co-star Luke Hamill was also one of many others to commemorate the anniversary of her passing on social media.
Carrie Fisher was 60 years old when died of cardiac arrest on a flight between London and Los Angeles, just two days after Christmas.