The lost city

Sofia was determined to find the lost city of Llaqta. Most legitimate historians thought it was a myth, but Sofia was sure the legendary city existed. So she'd traveled to South America. The journey was long and complicated. They'd drive down to the base of the amazon river and then travel by boat. Then a long trek to the heart of the jungle. Making matters worse her greatest rival Bridget Vanderholt was hot on the trail of the legendary city. Sofia knew Bridget was not only dangerous, but cunning and underhanded in her attempts to undermine Sophia.

Where along this epic pilgrimage do we find Sofia?