Directly quoting from the article on abc.au news that I linked to her profile in November 2019 (bolding is mine) :
As the author of a book on piano technique, Friedrich required his daughter to be a perfect exemplar, says Frances Falling, a singer, musicologist and research assistant at the Schumann-Haus in Leipzig.
"Apparently he was quite tyrannical at times," Falling tells RN's The Music Show.
"He had a very clear vision for what he wanted Clara to do, to be; he designed very carefully her days and took over all aspects of her life for a good 10 years, even writing her diary for her."
As Friedrich's protégé, Clara didn't disappoint. She made her public debut in Leipzig just after her ninth birthday.
Soon, a law student, Robert Schumann, heard her play and was so impressed by the young girl, he decided to devote his life to music. He asked Friedrich for lessons and became the Wiecks' lodger.
Over the next decade, with Friedrich her manager, Clara toured Europe. Liszt came to hear her perform. Paganini offered to play with her.
She became known for her performances of Beethoven, who had recently died, but she also played her own music, as pianists were expected to, including a piano concerto which she premiered, aged 16, at Leipzig's Gewandhaus.
"Even during her time, she could have been considered a composer," Falling suggests.
"The critics writing about this concerto were all very positive, saying they hadn't expected such 'serious' music and compositional talent from a woman."
To Friedrich's horror, Clara fell in love with Robert, nine years her senior.
They had to take the old man to court to obtain permission, but in 1840 they were married, one day before Clara turned 21.
The year he married Clara, Robert composed 138 songs, some of them among the greatest of the 19th century.
