So Fem!Thor is not The Thor

Pretty sure I called it. Per The Science Webzone io9*

When Thor becomes unworthy, a mysterious woman picks up Mjolnir

So there you have it.  "Thor" and "a mysterious woman" are separate entities.

*it's called The Science Webzone from now on as a courtesy to those baffled by what it's trying to accomplish running articles blaming things on Earth's shrinking ice caps, when Earth's ice caps are not shrinking.