Answer by taking a quote from the following article:

Tori Amos (born Myra Ellen Amos, August 22, 1963) is an American singer-songwriter, pianist, and composer. She is a classically trained musician with a mezzo-soprano vocal range. Having already begun composing instrumental pieces on piano, Amos won a full scholarship to the Peabody Institute at Johns Hopkins University at the age of five, the youngest person ever to have been admitted. She was expelled at the age of eleven for what Rolling Stone described as "musical insubordination.

With her Atlantic contract fulfilled after a 15-year stint, Amos signed to Epic in late 2001. In October 2002, Amos released Scarlet's Walk, another concept album. Described as a "sonic novel", the album explores Amos's alter ego, Scarlet, intertwined with her cross-country concert tour following 9/11. Through the songs, Amos explores such topics as the history of America, American people, Native American history, pornography, masochism, homophobia and misogyny. The album had a strong debut at No. 7 on the Billboard 200. Scarlet's Walk is Amos's last album to date to reach certified gold status from the RIAA.  Not long after Amos was ensconced with her new label, she received unsettling news when Polly Anthony resigned as president of Epic Records in 2003. Anthony had been one of the primary reasons Amos signed with the label and as a result of her resignation, Amos formed the Bridge Entertainment Group. Further trouble for Amos occurred the following year when her label, Epic/Sony Music Entertainment, merged with BMG Entertainment as a result of the industry's decline. Amos would later hint in interviews that during the creation of her next album, those in charge at the label following the aforementioned merger were interested "only in making money", the effects of which on the album have not been disclosed.  Amos released two more albums with the label, The Beekeeper (2005) and American Doll Posse (2007). Both albums received generally favorable reviews. The Beekeeper was conceptually influenced by the ancient art of beekeeping, which she considered a source of female inspiration and empowerment. Through extensive study, Amos also wove in the stories of the Gnostic gospels and the removal of women from a position of power within the Christian church to create an album based largely on religion and politics. The album debuted at No. 5 on the Billboard 200, placing her in an elite group of women who have secured five or more US Top 10 album debuts. While the newly merged label was present throughout the production process of The Beekeeper, Amos and her crew nearly completed her next project, American Doll Posse, before inviting the label to listen to it. American Doll Posse, another concept album, is fashioned around a group of girls (the "posse") who are used as a theme of alter-egos of Amos's. Musically and stylistically, the album saw Amos return to a more confrontational nature. Like its predecessor, American Doll Posse debuted at No. 5 on the Billboard 200.  During her tenure with Epic Records, Amos also released a retrospective collection titled Tales of a Librarian (2003) through her former label, Atlantic Records; a two-disc DVD set Fade to Red (2006) containing most of Amos's solo music videos, released through the Warner Bros. reissue imprint Rhino; a five disc box set titled A Piano: The Collection (2006), celebrating Amos's 15-year solo career through remastered album tracks, remixes, alternate mixes, demos, and a string of unreleased songs from album recording sessions, also released through Rhino; and numerous official bootlegs from two world tours, The Original Bootlegs (2005) and Legs & Boots (2007) through Epic Records.

What caused the problems?
those in charge at the label following the aforementioned merger were interested "only in making money",