A female scientist finds a way to visit alternate universes using a, um, cosmic can opener thingy. She doesn’t seem very well regarded on regular time Earth. I remember her going to an Earth that was very ancient Egyptian-like. Read the book in the early '90s but that doesn’t mean that was when it was written.
I know it isn’t a lot to go on but if any place can name it, it’s here on The Dope.