In the sacrament, wine represented the Son's blood, and bread represented His body. This came from the Last Supper.
After consecration, the bread and wine retained only their outward forms; their substance had already changed. This was also one of the inspirations behind Georgiana treating wine mixed with quinine as medicine rather than wine.
If you thought it was bread, then it was bread. If you thought it was the Son's flesh and blood, then it was flesh and blood. If you thought it was perfume, then it was floral water with alcohol in it. If you thought it was medicine, then it was medicine, even if it tasted exactly like wine.
It was actually quite simple. Though she was a witch and did not believe in God, she had listened to too much of Caprara's nagging. Francis was probably the same when he preached to those birds. Once you heard enough, you remembered it even if you did not want to.
Likewise, she intended to print some passages from the Bible on the labels of the "medicinal" wine bottles, something like "Smoking is harmful to health." Using Prohibition to ban alcohol was no longer feasible. Other than nagging them until they were sick of it, what else could stop those drunks from drinking?
The Methuen Treaty had not only failed to bring Portugal any trade benefits amid the Anglo-French rivalry, but had also hindered Portugal's industrial development. At the same time, Britain's wool and woolen textiles had profited from the treaty, while its domestic winemaking and grape cultivation declined, though the grapes grown in Britain were not very tasty anyway.
They were replaced by grain-brewed liquors such as beer and whiskey. When she thought of Germany, beer was the first thing that came to mind. She remembered that Belgians