Question: What is the ethnicity of Ivanka Trump’s mother?

full_context: Document 1: Ivanka Trump: Ivanka Trump ( born Ivana Marie Trump; October 30, 1981) is an American television personality, fashion designer, author and businesswoman who is an advisor to the President of the United States, Donald Trump. She is the daughter of the president and his first wife, former model Ivana Trump.
Document 2: The Trump Card (book): The Trump Card: Playing to Win in Work and Life is a 2009 book by Ivanka Trump.
Document 3: Ivan Chrenko: Ivan Chrenko (born 1967/68) is a Slovak billionaire businessman, the chairman and majority owner of the Slovak real estate development company HB Reavis. In March 2017, with an estimate net worth of US$1.1 billion, Chrenko became the first ever Slovak billionaire, according to "Forbes". Prior to Chrenko, Andrej Babiš became the first person of Slovak origin with a net worth above $1 billion, but he later became a citizen of the Czech Republic.
Document 4: Women Who Work (book): Women Who Work is a 2017 book by Ivanka Trump. A self-help book intended to help women achieve self-actualization, it deals with work-life balance among other topics. It includes guest essays and several businesspeople, political figures, and self-help authors are quoted.
Document 5: Elizabeth Christ Trump: Elizabeth Christ Trump (born Elisabeth Christ; October 10, 1880 – June 6, 1966) was a German-born American businesswoman and is considered the matriarch of the Trump family. She married Frederick Trump in 1902. While raising their three children, the early death of her husband in 1918 required her to manage his properties in order to support her family. She founded the real estate development company Elizabeth Trump & Son with her son Fred. The company, now known as The Trump Organization, is currently owned by her grandson, Donald Trump, who is the 45th President of the United States. Her great-grandsons, Donald Trump Jr. and Eric Trump are running the family business as trustees during their father's presidency.
Document 6: Ivan Bella: Ivan Bella (born 25 May 1964 in Brezno, Czechoslovakia (now Slovakia)) is a Slovak Air Force officer who became the first Slovak citizen to fly in space. He participated in an eight-day joint Russian-French-Slovak mission to the Mir space station in 1999.
Document 7: Business career of Donald Trump: Donald Trump is an American businessman, former television personality, and the 45th President of the United States. He began his real estate career at his father's company, Elizabeth Trump and Son, which he later renamed to The Trump Organization. He rose to public prominence after a number of successful real estate deals in Manhattan and New York City, and his company now owns and develops lodging and golf courses around the world. Trump partly or completely owned several beauty pageants between 1996 and 2015. He has marketed his name to many building projects and commercial products. Trump's unsuccessful business ventures have included several casino and hotel bankruptcies, the folding of his New Jersey Generals football team, and the now-defunct Trump University.
Document 8: Eric Trump: Eric Frederick Trump (born January 6, 1984) is an American businessman, philanthropist, and former reality TV personality. He is the third child and second son of the President of the United States, Donald Trump, and Ivana Trump. Alongside his older brother Donald Trump Jr., he serves as a trustee of The Trump Organization.
Document 9: Nancy Reagan: Nancy Davis Reagan (born Anne Frances Robbins; July 6, 1921 – March 6, 2016) was an American film actress and the wife of Ronald Reagan, the 40th President of the United States. She served as the First Lady of the United States from 1981 to 1989.
Document 10: Donald Trump Jr.: Donald John Trump Jr. (born December 31, 1977) is an American businessman and former reality TV personality. He is the oldest child of the 45th President of the United States, Donald Trump, and his first wife, Ivana.
Document 11: First Lady of the United States: First Lady of the United States (FLOTUS) is the informal but accepted title held by the wife of the President of the United States, concurrent with the president's term of office. Although the first lady’s role has never been codified or officially defined, she figures prominently in the political and social life of the nation. Melania Trump is the current First Lady.
Document 12: Kellyanne Conway: Kellyanne Elizabeth Conway (née Fitzpatrick; born January 20, 1967) is the current Counselor to U.S. president Donald Trump. She is the first woman to ever run a successful presidential campaign. She has been a Republican Party campaign manager, strategist, and pollster, and was formerly president and CEO of The Polling Company Inc./Woman Trend.
Document 13: Ivana Trump: Ivana Marie Trump (née Zelníčková , ] ; February 20, 1949) is a Czech-American businesswoman and former fashion model. She was the first wife of Donald Trump from 1977 until 1992.
Document 14: Jane Wyman: Jane Wyman (born Sarah Jane Mayfield; January 5, 1917 – September 10, 2007) was an American actress, singer, dancer and philanthropist whose career spanned seven decades. She was also the first wife of 40th President of the United States Ronald Reagan; they married in 1940 and divorced in 1949.
Document 15: Donald Trump: Donald John Trump (born June 14, 1946) is the 45th and current President of the United States, in office since January 20, 2017. Before entering politics, he was a businessman and television personality.
ground_truth: Czech-American