[9] In May 2005, fellow legislator Yin Ling-ying [zh] sued Chang for slapping her while the two lawmakers were lobbying the World Health Assembly in Geneva to admit Taiwan as an observer to the body.

[10] During her first legislative term, Chang drew attention to the amount of environmental damage facing Yunlin County, compared with the little compensation paid by the industries which cause it.

[11] Chang stepped down from the legislature at the end of her term in January 2008, and considered running for the Yunlin County magistracy in the 2009 Taiwanese local elections.

[19][23] Chang faced Democratic Progressive Party candidate Lee Chin-yung,[24] and took on the campaign platform "Blue Ocean Yunlin," emphasizing "big service," utilizing technology to form a strong welfare system and empathetic administration.

[36] Chang took issue with the Democratic Progressive Party-led government's 2017 revision of electoral law pertaining to farmers' associations.

In the aftermath of the African swine fever virus and one day after her inauguration, Chang imposed a ban on using food waste to feed pigs which took immediate effect to contain the spread of the epidemic in the region.

[49][50][51] As the price of peanuts produced in Yunlin fell in January 2020, Chang called on the Council of Agriculture to aid farmers.