People called her Mad Maddie to this quite blind old lady..
For some people she's just a lonely ordinary blind old lady with blurry background, ...but deep inside she has ability to see everything by controlling others mind just like her own point of view by blowing her smoking-like thing to her victims and start to controlling their mind.
She always thought that giving a happiness "gift" to her victim before they die is releasing the sins of her.
She kills all her victims by giving "what dreams you loved" or in the other words.."something you loved could kill you". A neverending massive permanent hallucinations that brings you deep diving into your dreams without knowing in real life your body is dying slowly to the death.
Technically she's not kill them, the victims kill themselves by loving "it" too much