Answer by taking a quote from the following article:

Tinashe Jorgensen Kachingwe (; born February 6, 1993) is an American singer-songwriter, dancer, record producer, actress, and model. She began her career as an actress and model as a child, making several film and television appearances, the most notable of which being the voice of the Hero Girl in the animated film The Polar Express (2004), Robin Wheeler on Out of Jimmy's Head (2007-2008), and Celeste on Two and a Half Men (2008-2009). In 2007, Tinashe joined the girl group The Stunners, with whom she released one extended play before they disbanded in 2011. She made her solo artist debut with two critically acclaimed mixtapes the following year,

In Case We Die, Tinashe's debut solo mixtape, was released in February 2012, recorded in her home studio. The mixtape spawned four singles, the first being promotional song, "Chainless", released to iTunes on December 19, 2011. "My High" was released for streaming on her official website. The music video for single "This Feeling" directed by Cole Walliser was released on May 1, 2012 to Global Grind. The mixtape's final single, Boss, was released August 20, 2012, after the song was featured in an episode of the VH1 series Single Ladies. The music video for the song was self-directed. The mixtape was received positively by the blogosphere.  On July 13, 2012, Tinashe announced that she had signed with RCA Records. Following the signing, her second mixtape, Reverie, was released on September 6, 2012 through her official website. The mixtape released three singles: the first "Stargazing", released on August 21, 2012; the second, "Ecstasy", released on December 18, 2012; and the final, "Who Am I Working For?", released on March 12, 2013. Upon its release, reviews for Reverie were generally positive.  From August to November 2012, a series of remixes of songs from Tinashe's two mixtapes leaked online to critical acclaim. On November 26, 2013, Tinashe released her third mixtape, Black Water. The mixtape was composed of thirteen tracks produced by Dev Hynes, Boi-1da, Ryan Hemsworth, and Tinashe herself. The single "Vulnerable", which features rapper Travis Scott, was declared a "Must-Hear Pop Song of the Week" by MTV's Buzzworthy on November 26, 2013.  Tinashe worked on her debut studio album in 2014. Recording took place in Los Angeles, London, Atlanta, New York, and Toronto. Tinashe worked with several producers, including Clams Casino, Ryan Hemsworth, Stuart Matthewman, DJ Mustard, T-Minus, Mike Will Made It, Boi-1da, Fisticuffs, Best Kept Secret, Ritz Reynolds and London on the track. On January 13, 2014, Tinashe released her first single from her debut album, "2 On". The song features American rapper Schoolboy Q, and was produced by DJ Mustard. The song entered the US Billboard Hot 100 chart at number 89, and has since peaked at number 24.  On June 29, 2014, Tinashe made her national television debut, performing her single "2 On" at the BET Awards pre-show. That same day, she also announced that her anticipated debut album, Aquarius, would be officially released on October 7, 2014. Speaking about the theme of the album, Tinashe said: "It combines the essence of all my previous work. I've stayed true to who I am. Obviously, there's some progression as I've grown as an artist, and I'm influenced by new things and what not. I think my fans will be really happy with it. I think it really embodies who I am and where I am creatively right now". The second single, "Pretend" featuring ASAP Rocky, was released on August 22, 2014. "Aquarius" debuted at number 17 on Billboard 200 with 18,000 copies sold in its first week. Tinashe also featured on Nick Jonas' "Jealous" remix.

how long was she with RCA Records?