Why did no whites go to America from Siberia thousands of years ago?

Actually, THIS woman wandered into a neolithic Mongolian camp and was forced to travel with them from present day Siberia across the land bridge.

I hear they made her carry their bundles, and took her spear away from her. Eventually, she married into the tribe, and today you can't really tell which of her descendants have that tiny drop of "white" blood.

It's quite a story, Inuit?