story: Ethel was terrified of growing old alone. She kept a tight leash on her husband. Ethel couldn't allow him to go more than an hour without calling. Or texting, as he was doing when he missed the curve and crashed. Ethel lives alone, with nobody to blame for it but herself.
 selected sentence: She kept a tight leash on her husband.
Ethel decides to keep a tight leash >Causes/Enables> Ethel keeps a tight leash