Totally agree that there is no way the nuns would have been so forgiving of the attempted abortion, or tolerant of the beauty pageant!
Attempted abortions went on often then, so as those nuns were mid-wives in the east end in those days, probably they would have been used to coming across them.
They were Anglican rather than Irish Catholic so they would have been different generally speaking, though who knows if they would have been quite so forgiving.
The writers must have to be careful of people in the present who have had abortions, or attempted them, and who may watch the programme.
In the original book the old nun `sister Monica Joan whose experiences went back to the late 19th C described 'surgical rape' at that time by police doctors capturing young girls to 'examine' them, on the pretext they thought they might be prostitutes with venereal diseases. So the nuns were used to everything,
There was another attempted abortion a long way back in the series too.