It has to be. She wrote 'RW' on my hand. Her initials.

[And no one else with those initials would be spending their time in the graveyard, trying to hug and comfort a pitiful child like Christine.]

I... hope you're okay, Riley. I... If there's anything at all you need to tell us... then take my arms, my legs, my voice, take anything.

[If Christine had to give them up for good, she wouldn't care. So long as Riley could be back...]