I think it's quite likely that they made the treatment sound as routine as possible in order to avoid media coverage that the Wales DC would find worrying or upsetting (because once it's "out there", there's no getting it back. There's no way to monitor what their classmates (and their older siblings) see and talk about, so the prudent thing is not to let the info out there in the first place.
It sounds as if she's still convalescent (or maybe has residual side effects) and it will be a phased return to Duties. Not least because if chemo is very recently finished, her immune system might be shot and so large indoors gatherings might need to be avoided for a while yet (I noticed that the only one mentioned was for Remembrance Day - which is outdoors on a balcony)