Rare

http://www.rcab.org/Pilot/2005/ps051216/sisterolga.html

"She became very much a sister to me in my heart, my soul, my spirit,” said Lydia Longoria, a BU graduate. “I think one of the best compliments anyone can ever receive is, ‘You remind me of God. You remind me of Jesus.’ I think we can all say that about Sister Olga.”
Currently there is only one other woman living as a hermit in the archdiocese, but Sister Marian Batho, CSJ, archdiocesan Delegate for the Religious, asserts that it is a calling that people are still responding to.

“The call to eremitical life is still very present,” she said.

There is a Catholic hermit up on Madeline Island also. Folks there give her food, wood for the stove, and check in on her well being.