Moving overseas or to another country means giving up almost everything, especially anything that has any weight to it.
They may have agonized over giving it, we don't know.. and now a days blankets can be replaced easily.. Of course I would have returned the quilt to you had you given it to me, but lots of people have no idea what goes into making one. I've had to part with wedding gifts too, sometimes life demands we give up some of what we have.
Don't feel bad, or think badly of them, we don't know the whole story, or what choices they had.. Just enjoy the quilt and bless that gal that called you!!