Thora Hallager (February 3,1821-June 16, 1884) was a Danish photographer. She was Denmark’s earliest female photographer.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Thora_Hallager

Self Portrait by Thora Hallager
Scan from negative / Royal Danish Library Digital Collections

Thora Hallager’s photographs of Hans Christian Andersen

Further reading:
https://www.fotohistorie.com/hallager-thora-kbh.html (in Danish)
Letters from Hans Christian Andersen to Thora Hallager (in Danish)