Memory loss?

"How did I get here, who are you guys?" Asks Cathy, sounding very frightened and scared. She grabs the blanket, and clutches it against her chest, covering herself for warmth and security. Ellen glances at you, looking very puzzled.

"It's Ellen, you know me, right?" Ellen curiously responds to Cathy's very absurd behavior. Cathy looks totally confused and she begins to wipe her wet face with the blanket.

"No, I don't even remember my own name," she sobs, with tears forming in her crystal blue eyes. Ellen then glances at you with shock plastered upon her face, and her mouth a wide 'O'.

"Oh my god! What have you done?" Ellen nervously panics once again. Ellen looks very frightened, knowing that her life could be jeopardized by this one incident.

"It was an accident," you calmly reply. "Just an accident. I'd get in trouble, not you anyways Ellen." You respond, trying to comfort your frightened friend.

"What happened?" Cathy innocently asks, questioning her current state.

"You fell down," you say, telling the half-truth. "A very hard fall," you continue, without really thinking.

“Oh,” Cathy responds, with the tears that were forming, not visible at all anymore. You wonder if she’s really lost her memory, or if she’s just pretending. Could she be that cold and sadistic?

“What’s the last thing you remember?” You question her, wondering if she’ll slip up somewhere. You’re not totally sure that she’s lost her memory, not sure at all.

“That’s the thing. I don’t remember anything at all,” Cathy responds, her blue eyes piercing yours, drowned with a clueless glare. ‘Could the bump have been that harsh?’ You question yourself, feeling the guilt thrive throughout your body.

“Should I call a doctor?” Ellen curiously asks you, lightly shaking like a leaf in the wind.

“Not yet, lets wait a while,” you immediately respond, thinking of what would be best to do next.

“This is not good, not good at all,” you hear Ellen, saying to herself, over and over, extremely worried and concerned. Cathy just sits on the bed, innocently watching as Ellen and yourself worry and think about your current situation. You glance over at the mentally injured R.A, and she looks at you with a blank expression.

“Maybe she’s pretending, you know that Cathy’s that kind of person,” you say in a low voice to Ellen. Ellen then glances over to Cathy, and back to you. She nods her head.

“Maybe she is, she’s like that, ya know.” Ellen whispers, agreeing with your suspicions.

“Am I Cathy?” The puzzled R.A questions the two of you. Before you can say anything, Ellen responds with a quick, “yeah.”

“Was I really a bad person?” Cathy questions the two of you, probably overhearing what you were talking about. Before you can answer her, you hear someone entering the room.

Who could it be? What happens next?