It is her source of comfort and rest. She won't sleep without them and when in distress, she calls out to them in a drawn out desperate sounding cry, nay plea, for her things... "plu..." and "ble..."
She often will sign for them, tapping her flat hand on her lips and pretending to pull the covers up to her chin. It is unmistakable what she is asking for.
Once she has them in her grasp she immediately shoves the plug in her mouth and puts the blanket to her nose. If you are privileged, while cuddling with her, she will rub said blanket on your cheek to show you how soft it is, almost to say "see, you would want it too if it was yours."
she is cute... and unfortunately, she knows it...