In 1932, he came to Peru from Germany and became a tutor for children in Germany's consulate in Peru. Not long after, she came into contact with the huge line drawings left by the ancient Nazca people in the desert, so she devoted all her remaining life to the study of them. These lines are well preserved thanks to the stability of dry desert climate. During the next half century, she helped the government of Peru map out more than 1000 lines. She found that some of them were signs of the summer solstice and suggested that these lines were some kind of astronomical calendar.
At the same time, she has been committed to protecting them. When the government wants to dig canals on them, she chooses to fight against the government. Reid recalled, "I used to live in a tent where I slept in a desert on a roof. Some locals think I am a spy or think I am crazy. Once a drunken man threatened me with stones, so I took out a sextant and pointed at him. He screamed and ran away, and on the second day the local newspaper published a story of a weapon mad German spy living among them.
Even now, it is still impossible to fully understand that the Nasca line can not clearly understand their meaning, but now they have become the world heritage of the United Nations Scientific and educational organization.
He became a citizen of Peru in 1992 and died in 1998.