Sheila wasn't in control of her faculties,Steve.She was a very very sick young woman,,,who wouldn't have been concerned with what she was wearing/or wasn't wearing. Her psychosis blotted out all that was normal as she listened to her orders coming from her sick mind.
Like her family,,,you don't realise how really ill Sheila was,,,with half the time the drugs that she took was cancelling out the benefit of her prescription drugs.