Actually she's impervious to all diseases according to herself. Probably includes cold. This isn't original Touhou anyway, so we'll have to assume li'l Moko-chan is no Hourai.
Is it just me or does mokou look like a ferret with a strectched body on the second panel?
Doting parent...Ah, yes!*pff*Moko-chan is always so calm and quiet...Ah, actually, this is her first vaccination.Mokooo!! I know you'll do just great!!Good luck~.Ms. Keine?Well then, see you later!*pff*