No one knows what brought Marion to this place. Since then she has not only cursed herself for being so stupid because she finally decided to come to William's residence. If asked if she did this because she was worried about the man? Then the answer is no.
Marion even decided to come at the urging of Leah who said that William had never been sick or had not come to work so far. And if he doesn't work, then that means he really isn't healthy. And that is a serious problem.
She doesn't know how many percent of the truth of Leah's statement, which is for sure now that she is standing in front of the gate of the Reynz residence which is surrounded by other equally luxurious houses, only William's house looks better than the others. Including the process, Marion had to go through until she finally arrived at the man's door.