Question: Who was a cast member of the soap opera with the character of Stella Mann?

full_context: Document 1: Nathalie Brandner: Nathalie Brandner (née Käppler, formerly von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". The character is portrayed by actress Jenny Winkler. She first appeared on 12 November 2004 and had her final appearance on 14 December 2010.
Document 2: Julia Mendes: Julia Mendes (born Prozeski, adopted von Anstetten and formerly Sander) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)", played by Valerie Niehaus. She is introduced in the series' premiere on January 2, 1995. She departed from the series in July 1997, when Niehaus decided to pursue other roles. The role was surprisingly recast with well-known actress Nina Bott in 2011; reinstating the Brandner family and the original story of the show. Bott appeared for the first time on-screen on June 23, 2011. She eventually finished shooting her story arc in October 2011 and last appeared on January 18, 2012. The character is known as the first protagonist of the show and her main story focuses around the incestuous love to her twin-brother Jan Brandner.
Document 3: Jan Brandner: Jan Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was played from the show's debut on January 2, 1995 to August 27, 1997 by actor Andreas Brucker. In March 2011, the role was surprisingly recast with actor Hubertus Grimm; reinstating the Brandner family and the original story of the show. Grimm debuted in the role on June 23, 2011. The role was reactivated on short-term for a special of the show on the Spanish island Mallorca. The character made his last appearance on January 18, 2012.
Document 4: Annegret Wittkamp: Annegret Wittkamp is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". She was portrayed by Gabriele Kastner from August 24, 1996 to August 28, 1996. In 2008 the actress Ursula Heyer, who is known previously for serving as the German dubbing voice for Joan Collins, took over the role and debuted on-screen on August 26, 2008. She left the show on November 25, 2008 after her three months contract was up.
Document 5: Christian Mann: Christian Mann is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". He is portrayed by actor Thore Schölermann from 27 November 2006. Schölermann was initially supposed to take a break after December 2012. However, it was later reported that the actor will not return full-time but in a limited capacity.
Document 6: Clarissa von Anstetten: Clarissa von Anstetten (née Prozeski and formerly Kaufmann) is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character is played by actress Isa Jank from the show's debut on 2 January 1995 to 5 September 2001 and again since 21 June 2011. She left the show again on 20 March 2013.
Document 7: Katja Brandner: Katja Brandner is a fictional character on German daytime soap opera "Verbotene Liebe" ("Forbidden Love"). The character was portrayed by actress Diana Frank from January 15, 2008 to January 5, 2009.
Document 8: Helena von Lahnstein: Dr. Helena von Lahnstein is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". The character has been played by Renée Weibel since October 5, 2009.
Document 9: Rebecca von Lahnstein: Rebecca von Lahnstein is a character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by Jasmin Lord and debuted on June 17, 2008. In 2009, Lord earned the "Miss Soap award" as the most beautiful actress in a soap opera, followed by the "German Soap Award" as Sexiest Woman in 2011. It was announced on January 18, 2011 that Lord is going to leave the show and finishes shooting in April 2011. She made her last on-screen appearance on July 27, 2011. After a few months the character was recast with Tatjana Kästel, who made her first on-screen appearance on February 13, 2012.
Document 10: Stella Mann (Verbotene Liebe): Stella Mann is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by model and actress Anne Wis from December 9, 2008 to November 10, 2009. She returned to the show with Claudia Hiersche as Carla von Lahnstein from January 28 to February 11, 2010.
Document 11: Jana von Lahnstein: Jana von Lahnstein ("née" Brandner) is a fictional character in the German soap opera "Verbotene Liebe" ("Forbidden Love"). The character was played by the actress Friederike Sipp from 1 October 2002 to 21 March 2005. The character was recast with Vanessa Jung, who played the role from 23 March 2005 to 20 February 2008.
Document 12: Timo Mendes: Timo Mendes is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". Remo Schulze debuted in the role on 23 June 2011. Timo is the son of Julia von Anstetten and her first husband Tim Sander.
Document 13: Judith Hagendorf: Judith Hagendorf is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)" portrayed by actress Katrin Heß from February 18, 2008 to September 15, 2009, when the character was surprisingly written out without any conformation from the production.
Document 14: Lydia Brandner: Lydia Brandner (divorced von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe" (Forbidden Love). The role was originated by actress Theresa Underberg on 16 January 2008. Theresa announced on 21 December 2010 that she will leave the show in early 2011. She made her last appearance on 29 March 2011.
Document 15: Tanja von Lahnstein: Tanja von Lahnstein (née Wittkamp, formerly von Anstetten, Rai and von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)", played by actress Miriam Lahnstein. She made her first appearance on-screen on 21 June 1995 and left after three years in May 1998. Lahnstein returned to the role in 2001, where she was seen from 24 April to 5 October. She came back another three years later and reappeared on 16 April 2004. Lahnstein left the show for a short time, while being on contract, from June 2005 to March 2006 and from March to December 2007 during the pregnancy of her two children. She left again in December 2009 and returned in April 2010.
ground_truth: Valerie Niehaus
sub_queries: Stella Mann >> present in work Answer: Verbotene Liebe
Verbotene Liebe >> cast member Answer: Valerie Niehaus