Good grief! She's not dying. She's going to be in the hospital. She'll have nurses watching after her. She'll be fine.
My husband who adores me (and vice versa) certainly did not spend the night with me post-op. That's what nurses and call buttons are for.
Yes, she'll need someone to take her home when she leaves the hospital. My hospital required a friend / family member do that. They won't let a taxi driver take you home. So she needs to cover that situation with her boyfriend or her son.
But otherwise, she'll get plenty of medical attention from the people her insurance company is paying to do those jobs.