While I'm not sure of what her name would be, or of any of the rumoured ones (which I feel none of them will be the final name...) I feel her personality would be somewhat emotionless. That is to say, she wouldn't be bold, but she wouldn't have spunk. Netural I suppose. I like Raven's theory, because the body language really does convey the shyness, but the blank face that almost appears to be a metal motionless mask leads me to think she'd have a proper, deliberate way of speaking but in doing so wouldn't be happy or sad about the situations or what she was speaking of. Maybe that doesn't seem fun, but over time she could gain some kind of emotion and that would be her character growth by game's end.
I'm trying to think of other existing characters to equate what I'm trying to convey to, but can't quite. It's sort of a blank emotion. Almost robotic in formality. She's essentially the spirit of an inanimate object, so she'd read with a fairly quite monotone voice that's neither for or against the events unfolding. More of a "this is my purpose, so therefore this is how I will act", but she wouldn't be heartily against evil or pro good.