What comic book did Adrienne Frost's Sister first appear in?
Adrienne Frost:  She is the older sister of Emma Frost and Cordelia Frost, but not much is known about her past. Emma Frost:  The character first appeared in "Uncanny X-Men" #129 (January 1980), and was created by writer Chris Claremont and artist/co-writer John Byrne.
"Uncanny X-Men" #129 (January 1980)