@greff Regarding locks or alarms, sooner is better. We had a family emergency when my son-in-law's Mom wandered away in the cold in a shirt, with no phone, purse or id. Fortunately the police found her at her former workplace before any real harm, but nobody in the family believed at that point that she would be lost in the neighborhood where she had lived for 30 years, and in daylight.
Right away his Dad got locks and alarms except to the backyard and deck, which had a fence with a locked gate. So she could go outside but not go far.