I've never stated this but in my head. But Sasuke isn't going to give his daughter trauma just to awaken sharingan. Also I don't see how her finding her real mother will cause her to awaken sharingan. Maybe watching her die or trying to protect her.
Sasuke is not in the village,wonder if He even knows He has a Daughter? And if Karin is the Mother did Sakura drive Her out of the village to take Sarada away from Karin?