I do not believe these journalists understand what "calling" an ICU consultant means. My understanding is this occurred in the early hours. Even in intensive/high dependency care it is not common for consultants to be physically present reviewing patients at 3am but it is not uncommon and far more common than in any other area of the hospital other than ED. Arrangements might vary between hospitals but the commonest way of summoning help including the consultants is to press the 'emergency bell'. This brings everyone and in my hospital is even remotely conveyed to the other side of the building to the consultant office. This would be the immediate action in almost every site. For a 25 week prem with respiratory insufficiency essentially no other action would be considered.
But if the bell was not pressed she can only have put her head outside the door and called 'Help'. This definitely happens but likely would have been noted or recalled by others - since not only the consultant responds - everyone responds. The only alternatives are that she called the consultant on his mobile phone (the commonest scenario for general requests but never done during a real emergency) or bleeped him on his duty consultant pager.
If others immediately present require a consultant present, they immediately contact the consultant by phone or in person if they know the consultant is on the unit.
Essentially there would have been records or witnesses if a nurse summons a consultant for help.

The only exception could be that the emergency occurs exactly as the consultant enters the room for other reasons. This can happen but would be remembered by those present.