mexican prosecutors have launched an investigation of possible criminal conduct in the case of a 14-year-old girl mistakenly sent to the u.s. to live with a woman who claimed to be her mother .
alondra luna nunez was mistakenly flown to texas on april 16 after a judge in the western state of michoacan ruled in favor of a houston woman who believed she was her daughter .
she was returned to her family in mexico on wednesday after dna testing in the united states showed she was not the long-missing daughter of houston resident dorotea garcia .