Female protagonist. Story starts out with her discovering that she has amnesia from a crash landing on a strange backwards world. She has a green triangle that glows in her forehead and special powers. She wanders around lost, trying to figure out who she is. Many of the people she meets on the strange world think she is either a goddess or a freak and is to be feared or worshipped. She does meet an old healer woman, I think blind, who befriends and helps her.
By the end of the story she figures out who she is and is subsequently found by her male partner or crew. I can't remember the title of this book, the author, or the main character's name!
It's not part of a series or trilogy. I'm pretty sure it was written in the 80s, but maybe late 70s? Also, I was a teenager when I read it so it might have been a young adult sci fi book.