No she does not die in book 6 but secrets are revealed such as the fact that she is working against Amy and Dan with an unknown number of alliances that pretend to be her friend from college.
Hope this helps!
No, Nellie Gomez does not die in book 6 of the 39 Clues series. She remains a key character throughout the series, supporting the Cahill siblings on their adventures.
she went through a glass wall bouncing a ball.
Nellie Pott died in 1963.
Nellie Martel died in 1940.
Nellie Unthank died in 1915.
Nellie Halstead died in 1991.
Nellie Briercliffe died in 1966.
Nellie Dale died in 1967.
Nellie Shabalala died in 2002.
Nellie Walker died in 1973.
Nellie Cameron died in 1953.
Nellie Neilson died in 1947.
Nellie Stockbridge died in 1965.