 During the reign of Joseph I, she endeavoured to keep her political influence in defiance of her daughter-in-law, Wilhelmine Amalia of Brunswick-Lüneburg, with whom she had a difficult relationship.When the marriage of her second son Charles was arranged, she supervised the Catholic education of his convert bride, Elisabeth Christine of Brunswick-Wolfenbüttel, and took her on a pilgrimage to Mariazell in 1706 prior to the marriage in 1707.Eleonore greatly disapproved of her son keeping an official royal mistress, Marianne Pálffy, but was powerless to stop it as she had no influence upon him.