This is just an explanation for Mercy's lashing out in her sleep.

Mercy's Dream POV

As soon as I put my head back on the couch, all the strangeness of today's events hit me like the stench of my wretched father's rose garden; I felt my eyelids drop, and I welcomed the darkness... but not for long.

'"Mercy, my child, my love, my light, what happened to you? To your hair? Oh my, your beautiful black hair is gone. Why do you sit so still? Why do you not talk to me? Have I done you wrong my pet?" A pause in the desperate pleading "Please my rose, answer me. What is it that made you this way? Please tell me swan, tell daddy what's wrong and I'll make it all better; just come back to me my swan, my sanity, come back to me... please."

A blink; a gulping of saliva – the first independent movements made for days – and the reaction is instantaneous – a gasp and a lurch towards my hands, enveloping them in a cold sweaty grasp.
The sudden clamminess makes me wrench my hands away, toppling off the chair and landing on the carpeted floor, shaking with disgust.

"Bella? Are you okay? Will you talk to me now? Will you tell me what's wrong?"

"You;" A shocked face, a beaming mouth, a rush of movement and he's there, kneeling beside me.

"What about me my darling? What's wrong?" A desperate shake of my head, a look of torn loathing and love directed at the man who raised me to be a monster.

"You; you are a monster. A foul, loathsome, cocky killer." Spit flies with the last word, a scramble as I get to my feet, unsteady after days of sitting.
An expression of betrayal and hurt, confusion and realisation. Then one of complete realisation and rage.

"Who did this to you Mercy? Who has corrupted your precious mind against me?" Hissing more deadly than any snake fills the room, then a sneer of knowing crosses that despicably reptile-like man's mouth, lighting his eyes with a gleam I know all too well – a shiver slides down my back and across my limp arms.

"I know who did this. It's that red head girl; the avox." The last word is spat so poisonously that I physically flinch away from it in fear.
"I don't... kn-know what y-y-you're talking... abou, ab... about." Another look of shock at the faltering, robotic noises coming from my dry lips – I bring a hand to my throat slowly, unsure of wether that was really me or not.

Eyes narrowed into slits stare at my hand "She'll pay for what she did to you my jewel. She'll pay."

Footsteps echo through the hall as he walks away with me trailing close behind, Watena in hand, her hair turned red and mouth gone, her clothes painfully white and simple.
"Bring me the red head avox!" He roars to no one in particular.

Lavinia is strapped to a sterile white table, whimpering and crying with fear. She turns her head and bores her bright intelligent eyes into my cowardly, ashamed brown orbs. I bite my lip until I taste blood, and just as the monsters in lab coats are about to begin their horrific task, something snaps in me, and I launch myself at the closest beast with a savage snarl.

I claw, bite, kick and punch like a wild animal. I feel something jabbed into my side, but in the confusion, I am not sure if it was intentional or not.
Before long they have tackled me to the ground, but I am still writhing and hissing, screeching at the top of my new voice -
"No! Leave her alone! Stop it! STOP IT!" Someone picks me up and carries me out of the room like a sack of potatoes.

The sudden burst of strength fades away and I am left sobbing, begging to the wind – "Leave her alone... please" Red seeps slowly across Watena's body, and a grimace of pain stitches itself onto her face, a single drop of blue on her pale cheek.

The strangled screams of a girl with no tongue fracture the air, filling my head long after they have stopped.

Hopefully that explained why Mercy freaked out so much when her doll suddenly got a mouth.