Why does Lucy change her mind and What is Miss Lucy's intention in Never Let Me Go?Miss Lucy told Tommy that it was okay for him to not be as...

In Ishiguro's novel Never Let Me Go,
Miss Lucy is a teacher at Habersham who encourages her students to create works of art.
 Spoiler alert in next sentence. She does not push Tommy at first
because he is not interested, and there is still quite a bit of time before the children
leave the school to prove that these clones do indeed have souls.  She knows what the
fates of these children are, and she attempts unsuccessfully to save them through their
art.  Their art will prove to the world that these clones are human too--that they are
comprised of bodies AND souls, that they have imagination, creativity, and immortal
parts. They are not items that can used and disposed of.  She wants to show that these
children are worth saving, but ultimately not strong enough to accomplish her
goals.