How is legal separation defined in Louisiana?

The lady I’m dating has filed for divorce from her husband. She had a brain mass caused by his blows to the head. She has 3 kids and has filed for divorce in Louisiana but he won't get out saying she's under doctor’s care. And, since he is father and needs to be there, she filed legal separation papers and he lives somewhere else. When she wakes up some mornings the kids have let him in and he's on the couch. In Louisiana does this void the legal separation? Or do they have to be intimate to void separation? What does the law say?