Original: She allied herself with Empress Maria Theresa , who promised Ã lisabeth the throne of the Southern Netherlands ( now Belgium ) , which had been returned to Austrian rule under the Treaty of Aix-la-Chapelle .
Simplified: She allied herself with Empress Maria Theresa , who promised Louise Ã lisabeth the throne of the Southern Netherlands , which had been returned to Austrian rule under the Treaty of Aix-la-Chapelle .