They told officials they were protesting a visit by the president of Peru. Q'orianka Kilcher's father is a Peruvian Indian.
Park Police spokesman Sgt. David Schlosser identified the mother, who's charged with defacing government property, and daughter, who's charged with disorderly conduct.
Kilcher's agent Carlyne Grager confirmed the arrests and said the actress is a strong supporter of indigenous populations around the world.
Kilcher played Pocahontas in the 2005 film, "The New World."
(This version CORRECTS APNewsNow. correct to agent, sted publicist.)