[She's been checking in on him occasionally, too - since she spent the evening with Anne and baby dauphin during the party, since they both stayed behind - and probably spoke with Porthos since then]
[So she's knocking gently on the open door - just indication that she's here - before moving over to his side and sitting down beside him. Hey, she's been there... she knows what this feels like and it's not pleasant and there's no real way to make it 'better']