Preston's character Arlene has been concerned about the actions of her baby son Mikey lately.
However, Preston told New York Magazine that the kidnapping of Mikey in recent episodes made Arlene realise how much she cares for him.
"I think for Arlene, she's just relieved to have the child back," she said. "Any ambivalent feeling she had about the child went away once that fire happened and she realised just how much she loved him and was going to do whatever she could to protect him."
Preston continued: "What I think has been interesting about my character this season is it also kind of taps into every parent's fear that they might be raising some kind of demon child. Not a literal one, but, 'What if I don't know how to raise this child?' Or, 'What if this child winds up having problems that I can't handle?'"
Preston also revealed that she believes "there's a spiritual element" in the world.
"Have I experienced a ghost first hand, per se?" she said. "No. I guess I've experienced feelings or some kind of presence. But I certainly haven't seen any kind of transparent entity running around. And they certainly don't fly in my mouth the way they do to Lafayette!"
Preston recently admitted that Arlene is "designed to be ridiculed" but suggested that she has become more well-rounded as the series has developed.
True Blood airs on Sundays at 9pm on HBO.
> True Blood cookbook to be released in 2012
> Read more True Blood coverage
Watch a clip from the next episode of True Blood below: