How the White Witch treats Lucy and the beavers?

The White Witch turns Lucy's friend, Mr. Tumnus, into
stone because he has befriended Lucy. Then when the children meet up with the beaver
family, Mr. Beaver tells them the history of the White Witch, and how she is falsely
claiming to be the Queen of Narnia. The beaver family tells the children the only hope
to defeat the White Witch is to meet up with Aslan at the Stone Table. As the children
flee with the beavers to meet Aslan, the White Witche pursues them, so they are all
petrified that she will catch up with them. Slowly, however, the snow that permits the
Witch's sleigh to move fast through Narnia begins to melt. The White Witch knows that
this means that Aslan is "on the move." Eventually her sleigh can no longer navigate the
snow because the return of Aslan means the return of springtime to
Narnia.

The melting snow foreshadows the melting of
everything the White Witch has turned to stone, which Aslan will turn around by
breathing on the stone animals in the next few chapters.