SOLVED Heroine comes back from space expedition and finds out hundreds/thousands of years passed on

I haven't read this book but I had it on my old kindle. I checked my Amazon Library but the book I'm after just isn't there.

So... what I remember from the blurb.

Heroine is a part of a space expedition. She and the rest of the crew spend a few years exploring the galaxy and now they on their way to go back home, to Earth.

But as soon as they land they realize that their "few years in space" equaled few hundred/thousand years on Earth. IIRC pure blood humans no longer exist (and if they are, they very rare and precious). The Earth has been invaded by few different species of aliens while heroine was in space and now the human/alien hybrids waring each other.