Final answer:
The provided excerpts suggest themes of danger and mystery with children involved, but do not specify what happens to Wendy's stepdaughter at a motel, and thus the question cannot be answered decisively.
Step-by-step explanation:
The excerpts provided from various sources suggest a theme of fear, mystery, and possibly harm regarding children in different contexts; however, they do not specifically describe what happens with Wendy's stepdaughter at the motel. These narratives range from the Hadleys' concerns about their children breaking into a dangerous nursery, to the real-life account of Scott Falater, whose sleepwalking defense in the murder case of his wife presents a chilling scenario. In each of these, there is an underlying tension and the implication of a threatening or tragic event, but the fate of Wendy's stepdaughter at the motel remains undefined unless it is directly tied to one of these excerpts. As a result, we lack sufficient context to answer the question definitively.