[He doesn't say something to disagree with her, but he gives her a look that clearly says he doesn't buy it either.]

Rest, child. You need it and it will make you feel better.

[In his head is silently going through what little he knows about sickness, to figure out if there is something more she needs than rest.]

No thanks are needed, but you are welcome in any case... I would not leave you to face such alone when there was something I could do to aid you.