If she’ll never go again, why is there such an inyan do make her go before the wedding?
In Israel you can only have a Halachic wedding. The only way not to is to go to Cyprus , Prague or somewhere out of the country.
The Rabbi is trying to navigate to give the couple a proper jewish wedding otherwise there will be no jewish wedding, they will either live in sin or go to cyprus.
I suspect here, there was somthing similar going on, the couple might have refused to make Sheva Brochot and the Rabbi said something like fine you can both say it. In order to get at least the man to say it.