Answer by taking a quote from the following article:

Clara Ann Fowler was born on November 8, 1927, in Claremore, Oklahoma (although some sources give Muskogee) into a large and poor family. Her father, B.A. Fowler, worked on the MKT railroad, while her mother, Margaret, and older sisters picked cotton. As she recalled on television many years later, the family lived without electricity, and therefore she could not read after dark. She was raised in Foraker, Hardy, Muskogee and Avant, Oklahoma, before attending Daniel Webster High School in Tulsa, from which she graduated in 1945.

Before releasing "Hush...Hush, Sweet Charlotte," Page signed with Columbia Records, where she remained until the end of the decade. She released a few studio albums for Columbia in the 1960s. In 1970, her singles began to chart on the Hot Adult Contemporary Tracks chart. Many of these singles became hits, peaking in the Top 20, including cover versions of "You Can't Be True, Dear," "Gentle on My Mind" and "Little Green Apples" (the latter being her last pop chart entry). Page, who was a fan of country music, recorded many country songs over the years. Some of these were recorded for Columbia and were released as Adult Contemporary singles, including David Houston's "Almost Persuaded" and Tammy Wynette's "Stand by Your Man." Page left Columbia in 1970, returning to Mercury Records and shifting her career away from pop and into country music. In 1973, she returned to working with her former record producer, Shelby Singleton.  Working for Mercury, Columbia, and Epic in the 1970s, Page recorded a series of country singles, beginning with 1970's "I Wish I Had a Mommy Like You," which became a Top 25 hit, followed by "Give Him Love," which had similar success. In 1971, she released a country music album, I'd Rather Be Sorry, for Mercury records. In 1973, a duet with country singer Tom T. Hall titled, "Hello, We're Lonely" was a Top 20 hit, reaching No. 14 on the Billboard Country Chart.  In 1973, Page returned to Columbia Records' affiliate Epic Records. In 1974 and 1975, she released singles for Avco Records including "I May Not Be Lovin' You" and "Less Than the Song," both of which were minor country hits. After a five-year hiatus, she recorded for Plantation Records in 1980. She had a Top 40 hit with Plantation in 1981 titled "No Aces," followed by a series of minor country hits, "My Man Friday," which reached No. 80 In the early 1980s, she performed with major symphony orchestras in Cincinnati, Ohio, and Mexico City, Mexico. .

What led to Page changing her musical style in the 60s?