Answer:
I believe she established an assylum for the mentally ill.
Explanation
"Dorthea Dix layed an instrumental role in the founding or expansion of more than 30 hospitals for the treatment of the mentally ill. She was a leading figure in those national and international movements that challenged the idea that people with mental disturbances could not be cured or helped."
The main idea of this phrase talks about the ending of slavery. It says that slavery is not allowed in any form, and is illegal. No one, no matter their gender, race, ethnicity, etc., is allowed to be a slave.
I hope this helps you! :)