Whether Wang Xinyi is a daughter of that person or not, there is no actual evidence to support that when she herself doesn't even know him. The only resemblance is that they have identical pairs of eyes.
Considering this recent event, it is most likely that the identity of Wang Xinyi is not simple no matter what her parentage is.
Due to the car being burnt along wth the important documents that Aaron has during that time, the only way Xi Ana will know what the result of the investigation is to ask Aaron himself once he is awake.
Or he could ask someone else re-investigate it again but that would certainly take so much time and she doesn't have the luxury to wait right now.
