There don't seem to be any public records on where Lyda Newman went to school unfortunately.
This may be because, as a woman and an African American growing up in the late 1800s, there was no social expectation for Lyda to attain more than an elementary education.
We do know that she grew up in New York, and worked there as a a hairdresser. This is where she invented her hair brush that revolutionized women's beauty products.
There's another Blurtit answer that goes into her circumstances in a bit more detail if you'e interested:
//www.blurtit.com/4364946/what-school-did-lydia-newman-go-to
