...If he's suffering from what most of the others are, then he knows that I can help by giving him some energy, and wants me to do so. Just the thought of being bed-ridden must be irritating to him, after all.
[And a small, half of one on her part. She may not know Lelouch as well as Suzaku, but even she can tell that he's the type to react horribly to having to stay in bed. It would interfere with something he was planning to do, no doubt]