Idiom Definition:
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"to set someone straight"  
    to inform someone about the actual facts of  a situation when that someone does not have the actual facts or is ill-informed
     
Synonyms:
acquaint, advise, apprise, brief, edify, educate, enlighten, familiarize, forewarn, illuminate, instruct, invest, level, notify, relate, show, teach, tell, tip, update, warn, wise
 
   
   
Literally, 
setting her straight. - - - - ->  
