I'm annoyed that my wife keeps locking the deadbolt to our house
Has she explained why she keeps locking the deadbolt?
She claims she just wants to lock up the house.
Does your wife feel unsafe? Maybe you could talk with her about her fears and try to help her stay calm? Everyone gets scared and needs reassurance from their partner.
I think she's taking this to an extreme level and I want her to explain why she's doing this.
Talking to your wife will encourage her to discuss her fears with you. She needs your love and kindness because she may be reliving some trauma from many years ago. Be patient with her and help her get through her issues.