She wanted instead to raise public awareness about what she sees as the incoming president's lurking fascism and potential damage to her beloved chorus's reputation.
So last week the lifelong Mormon and mother of three sent a resignation letter to the choir president and her fellow singers, then posted it on Facebook. It immediately drew a torrent of responses and media reports from across the nation and around the globe.
Chamberlin was taken aback by the media interest, having no desire for fame or recognition, she said Tuesday, "but I stand behind my decision 100 percent."
Now the choir has chosen the 212 musicians to perform at the inauguration, an LDS Church spokesman confirmed Tuesday, but Chamberlin's dissenting voice continues to drive much of the conversation as she fields questions about her faith, motivation and miniprotest.
Within hours of posting the letter on Facebook, she began to receive hundreds of mostly positive comments about her stance as well as thousands of "friend" requests.
Originally from Southern California, Chamberlin earned a degree in music at LDS Church-owned Brigham Young University and later returned to Utah to rear her children — who have all been supportive of their mother in her desire to speak out.
Her husband, she said, has backed her as well.
The impetus for her resignation, she said, was a "nasty" Facebook post from a fellow choir member, dubbing those who declined to participate as "unpatriotic" or not "faithful to the faith," and suggesting they quit.
"That rattled me," Chamberlin said, and launched an internal struggle and a ton of praying. Ultimately, she decided she needed to do more.
The choir's performance, she argued, would send the wrong message to outsiders in the United States and abroad — that the famed Mormon singing group supported Trump's behavior and positions.
On that score, one line in the soprano's resignation letter drew some harsh criticism.
"I could never 'throw roses to Hitler,' " Chamberlin wrote. "And I certainly could never sing for him."
She defended that statement Tuesday, seeing "striking and frightening similarities" between the two men.
Both were narcissists who desired "power and wealth," she said. Both promised prosperity and economic security by creating scapegoats to blame. For Hitler, it was the Jews; for Trump, it is refugees and immigrants.
The Nazis set up a national Jewish registry; Trump talked of making Muslims register, Chamberlin said. Neither respected anyone who opposed him.