I assume the question is related to
THIS ONE
Keep in mind that certain elements of the game are random each time you start a new game. Dektora might be either a replicant or a rep sympathiser. And she might or might not buy the scorpions to plant them in Early's chair (as vengeance for him abusing Lucy), whether she's a rep or not. This leaves 4 different combinations.
If the picture from Izo shows Dektora, then she's probably a rep.
If the picture shows Deckard, then Dektora might be human.
Before you confront Izo, the scorpion cage will still be at the Peruvian lady. But later (Act 3 ?), Dektora may have bought them and then they will be in Early's chair. Afaik, this isn't an indication whether Dektora is a rep. Not sure if your actions have any influence on Dektora's decision to buy the scorpions or not.