Her growing debts 'preyed on her mind'. [=she worried about her growing debts]
Too often elderly people are 'easy prey' for swindlers and other criminals.
The thought that he could have done better 'preyed on his mind'.
(..) So don't think you're crazy for trying to do that. You do what you think is right. You do what you have to do. Mia. "The Devil preys on the weak and the vulnerable. Seeking to devour their souls... To perform incantations... Spilling the blood of kin. Spilling the blood of an innocent." (..)2014 Annabelle