She was his mother, she left the earth when he did. He floated away and she grabbed onto him, unable to keep him, she allowed herself to float away with him.
She never meant to survive without him, can a broken heart beat? can one live without air in their lungs? Bleeding and suffocating she refused to survive.
You will see her, that ghost... she may smile as she floats by, but she will never show you the hollowness inside. She wears a mask of humanity, a shell pretending to exist in this realm but her soul has gone forever.
Rest in peace dear mother, I know the pain was too much and the lure was too strong to keep you here. Rest in peace.