|Image from Der Wik|
As you would expect from those times, he was better known than she, even though she was a musical prodigy from an young age. But they had eight children together (only four of whom survived to adulthood), and she was the primary caregiver for them. Her husband fell ill (perhaps bipolar disorder) and she became the family's primary caregiver, especially after his death in an asylum.
This left little time for composing. As her husband wrote about her:
Clara has composed a series of small pieces, which show a musical and tender ingenuity such as she has never attained before. But to have children, and a husband who is always living in the realm of imagination, does not go together with composing. She cannot work at it regularly, and I am often disturbed to think how many profound ideas are lost because she cannot work them out.Nevertheless, she ended producing a fair number of compositions. You wonder what she might have created had she had a less hectic family life.