All this nun is doing is showing she does not even know her own Catholic religion. For one thing, God and Yahweh are one and the same. He is the God of Abraham, Isaac and Jacob, the God of Christians and Jews.
Also, the name Yahweh was considered so sacred by the Israelites, they never pronounced it. They used other words to convey the name of God. Further, out of respect for the Jewish faith regarding use of the name Yahweh, a while back The Vatican requested that the word not be used anywhere during Catholic services.
Lastly, Allah is not the God of Christians and Jews. To claim that God and Allah essentially are one and the same is nonsense.
Do you perchance know what word is used for the English ‘God’ by Christians who are native speakers of Arabic?
Along those lines, Campbell is a sister not a nun. Big difference.