SF Time Travel Female inhabits Queen Elizabeth's mind

I read this maybe 30 years ago. It featured a future society where kids could go back in time as observers and see historic events take place, their consciousness hanging out in the brains of people in the past. The book opens on "Experience Day." The main character and her best friend get to experience sex for the first time vicariously.

The main character and her best friend grow up. They really enjoy this passive time travel and decide to become historians so they can keep visiting the past. The main character realizes that she can actually take control of her host's body when the host loses consciousness. And scientists realize that they've accidentally retrieved the consciousnesses of some people in the past. Travel to the past becomes heavily restricted. The main character starts to visit Queen Elizabeth again and again and ...
well, things happen.

I found it! Pillars of Salt by Barbara Paul

touchstone fairy: Pillars of Salt by Barbara Paul

eta correct link

Err Umm when I clicked onto your link >3 lquilter: I got fadio faquir

I have had that same problem. We just have to choose the relevant book.

This should be the correct touchstone: Pillars of Salt

4 > thanks; i fixed above. sloppy!