WI: A different bride for Louis XV

So, according to Wikipedia, it was Peter the Great's intention to marry his second daughter, the future Empress Elizabeth of Russia, to Louis XV but the Bourbon's refused due to her mother's lineage. What if the Bourbon's hadn't refused and Louis XV and Elizabeth were wed?
 
So, according to Wikipedia, it was Peter the Great's intention to marry his second daughter, the future Empress Elizabeth of Russia, to Louis XV but the Bourbon's refused due to her mother's lineage. What if the Bourbon's hadn't refused and Louis XV and Elizabeth were wed?

Would she convert ? I'm not familiar with her. catholicism was a big deal and I don't see some kind of mixed marriage being agreed upon.
 
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