is karen gillan in the fires of pompeii
Yes, she returned in the fifth series
The Fires of Pompeii
Karen Gillan returned in the fifth series 
wiki:22922708
The Fires of Pompeii [SEP] Cast notes
Two of the cast members of "The Fires of Pompeii" were later cast in starring roles for "Doctor Who". Karen Gillan returned in the fifth series to play Amy Pond, full-time companion of Matt Smith's Eleventh Doctor. Casting director Andy Pryor suggested her to new executive producer Steven Moffat based on her performance in this episode as one of the soothsayers. Peter Capaldi was cast as the Twelfth Doctor in 2013, and made his first appearance in the 2013 Christmas special "The Time of the Doctor" (with an uncredited cameo appearance in the anniversary special "The Day of the Doctor").