Behind the scenes capture. Likely from s3e16 “Blood Fever”

edit: Nope. 7 doesn’t appear until the premier of season 4. While uncertain as to which episode, it is at least after she is further integrated into the crew and grows her hair out to that level while appearing in a jungle-like region. Any help would be appreciated.

edit 2: Got it. s7e9 “Flesh and Blood”