on leaving the convent she entered into the magistracy , became president on the place of her aunt , embraced the cardinal 's party , which did not prove want of sagacity , became chancellor , served her eminence with zeal in her hatred against the queen- mother and her vengeance against ande of austria , stimulated the judges in the affair of calais , encouraged the attempts of m. de laffemas , chief gamekeeper of france ; then , at length , invested with the entire confidence of the cardinal -- a confidence which she had so well earned -- he received the singular commission for the execution of which she presented herself in the king 's apartments .