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jokerxhisoka: No, it was the same in the WN as well.
That girl gave Rimuru the solution because of the Myth (also the myth is closely related to some connected to Rimuru).
The things that was changed between WN and LN were, the Barrier was applied by people of the Church (that girl wasn't involved with it).
Also, those 3 kids from before (the ones who caused the issue) weren't in WN, neither did the Kingdom uses their activity as excuse to attack (in the WN, the people from the church just came in, declared that since the country was created by monsters it has to be destroyed, and then killed many people and left after declaring the war).