Chapetón's parents migrated from rural areas to the city of El Alto during the 1960s due to the lack of employment opportunities in their places of origin.

[2][3][4][5] Chapetón joined the National Unity Front party, led by La Paz businessman Samuel Doria Medina, in 2005.

[6] In this position, she backed the demand that the new Constitution require a two-thirds vote in the Assembly, and opposed the text drafted by the Movement Towards Socialism-led majority.

During these five years, she put forward demands upon the national government to support the city of El Alto[8] and was a critic of Patana's administration.

[11] In the 29 March 2015 elections, Chapetón won 54% of the vote and obtained a municipal council majority of 6 (of 11) members, allowing her to govern and have her executive decisions approved.