My mother has developed dementia and tends to wander without warning. The memory care facilities in our area cost a lot. One alternative would be to place her in assisted living in the same building as my sister currently lives in independently. The problem is this: it is not secured, and they cannot guarantee that someone will be at the exits during the night to insure that she doesn't wander outside. Any ideas on how we can keep her from wandering at assisted living without running into the same cost issues as memory care?