WI: Instead of Polish Partitions, Maria Theresa returns Upper Silesia to Poland

From what I have read Maria Theresa and the Wettins might be okay with partitioning Silesia between them, what if Maria Theresa decides to return Upper Silesia(Opole-Raciborz and Cieszyn) to the PLC in exchange for Lusatia an alliance against the Prussians. how would this effect history and would Poland be stronger ITTL?

@Jan Olbracht @krieger
 
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