She doubts he means that to be offensive. "I'll never stop worrying about you, Frank. Do you think the only reason I want you here is because I feel like I have to take care of you?"

Her hand presses more firmly against his chest, and she uses the hold as a way to push herself up to look down at him. She doesn't mind his needing her, doesn't consider taking care of him to be a chore. If anything, she likes that he trusts her enough to depend on her. And she desperately wants to think that he'd be here regardless of whether or not he could hear or feel things.