What do you do when you know of a 66 yr. woman with a broken hip is home alone during the day?

I agree with ba8alou. Stop by to see if she needs anything and bring her a home cooked meal.

Bring her a casserole. Ask her if she needs anything.

Unless she has some type of mental impairment that keeps her from making her own decisions, her healthcare is up to her. She's only 66. She knows better than anyone what she is capable of and it's her choice.

Unless she had dementia, I'd leave her alone.