mexican prosecutors are looking into possible criminal conduct .
alondra luna nunez was flown to texas on april 16 after a judge ruled in favor of a houston woman who believed alondra was her daughter .
dna testing in texas showed that she was not dorotea garcia 's daughter .
the 14-year-old was returned to her family in mexico on wednesday .
alondra 's case drew international attention after a video of her being forced into a police vehicle last week appeared online .