I think she probably spent most of her time hanging out at home.
My sociopath father leeched off my mother until she issued an ultimatum (after about 15 years of sponging)--get a job or get out.
She left for work earlier than he left. He'd hang out at home until about an hour and a half before she was due to get home, then he'd bathe, get dressed in work clothes, and take off until shortly after she arrived home. After she was home and lubricated by a drink of two, he'd come home from his "long day at the office," and settle in for cocktails. On work days when she was at home, he dressed for "work" and parked himself in the library or someplace else for the day.
This went on for YEARS. I knew of it because I stayed in their house when visiting from out of town. (Yes, my silence was implicitly expected; yes I was an enabler. The dynamics are perplexing even to me, even from a distance of many, many years.)
I'm betting this was Casey's MO. Though I probably would have checked "all of the above" if it'd been an option.