Raven was born in Lorenskog, Norway; her father is a teacher. She has an older brother and two younger sisters. Her surname is of Norse origin, with Ravn meaning Raven, which she adopted as her stage name Marion Raven as well as her trademark raven logo. Raven enjoyed singing from a young age, sometimes writing lyrics for the songs she sang.

In early 2006, it was announced that Raven quit her contract with Atlantic Records due to "artistic differences". Raven later confirmed that she was now signed to indie label Eleven Seven Music, which was created by her management 10th Street Entertainment.  Raven later performed a duet with rock musician Meat Loaf on a version of the song "It's All Coming Back to Me Now", released as the lead single from Loaf's tenth studio album Bat Out of Hell III: The Monster Is Loose in October 2006. The track peaked at No. 1 in Norway and reached the top ten in Germany and the United Kingdom. Raven later joined Loaf on an extensive tour through Canada and Europe in February 2007.  In 2007 she also recorded the theme song for the US dub of W.I.T.C.H., a Jetix animated series based on the same name comic.  Raven later confirmed that her new album would contain new and old tracks from her Norwegian debut as well as re-recorded tracks such as "Heads Will Roll", which received the help of American musician Nikki Sixx and was released as an EP in October 2006. Prior to the release of Raven's album Set Me Free in March 2007, she toured around The Netherlands, Germany and the United Kingdom to help promote it. Raven later embarked on another promotional tour across the UK and performed in British schools. Later between later July and August, she became a supporting act on American singer-songwriter Pink's I'm Not Dead Tour in Germany. The album was later released in June 2007 and sprawled two singles; "Falling Away" and a re-release of her previous single "Break You" from her Norwegian debut album.

Using a quote from the above article, answer the following question: why did she quit?
due to "artistic differences".