"She should’ve stayed with you" I mean it's Japan unless she's a stay at home housewife or higher up than generic office lady, unless it's like hospital serious I imagine most jobs would still not let them take a day off for taking care of a sick student if she's already teen age vs maybe coming in on lunch break or being like 20 mins late for work feeding her and making sure she's asleep before leaving
Tho I would've loved to sleep home by myself my parents were the type to make me go to school no matter how sick