Of course it isn't 'incomprehensible'.
The NHS doesn't have several bereavement suites sitting there ready just in case. I would assume - if that particular unit has a bereavement suite - then it may well have been in use. Presumably a maternity hospital was preferable to A&E for a woman who has just given birth.
It is an incredibly sad situation all round. As is every still birth.
Maternity services in the country are dire, and have been for years - my eldest is 30 and they were poor then but became much worse since.
I don't think a thread with people speculating over what actually did or didn't happen to this one person is helpful to anyone.
A campaign for improved maternity services, OTOH......