The Purple Blankey

Heaven has a blanket she got from her God Mother. It's soft, purple, and says Heaven Leigh in pretty cursive writing.  We never leave home w/out it, she hates to give it up to be washed, and once we almost lost it on a walk home and a kind person set it on a cone so no one would step on it. (My husband went out at 6am before work to look for it Heaven refuses to do anything w/out it and usually walks around w/ it in her mouth (yuck). I wait for the day I'll never see this blanket again. I'm just not sure when I'm supposed to wean her from it.