As the protagonist is describing how she is going to pull off this acting stunt, she describes how she has been left to her own devices and is not being watch over by anyone at the time. She states, “having no Body in Town, at that Time, to whom she was oblig'd to be accountable for her Action”. Due to this independence, I believe that our protagonist anticipated a situation that she did not fully thinking through and seems to jump on the impulse of the idea. This impulse and lack of true pre-planning is described in Fantomina when she stated that, “Therefore thought it not in the least a Fault to put in practice a little Whim which came immediately into her Head”. This impulse shows a type of mental immaturity that causes more trouble than the idea was worth in the end. As stated in the end of the quote, our protagonists had, “no other Aim, than the Gratification of an innocent Curiosity”. This quote shows how her expectations of the situation were very different than the reality of the situation. At first, this acting stunt was an attempt to experience something new and exciting, but soon spiraled out of control and lead to the unintended reality that our protagonist did not expect.

Enlightenments Source: Excerpt from "The Elements of Moral Philosophy"

In this excerpt from The Elements of Moral Philosophy by David Fordyce he states that, "no kind of Objects make so powerful an Impression on us as those which are immediately impressed on our Senses". This is a great explanation to the events that begin to occur in this passage of Fantomina. Our protagonist is immediately hooked to the idea of acting as the woman in the pit and seems to quickly jump on the opportunity. David Fordyce is describing the same sort of impulse that the protagonist of Fantomina jumps on and suggests that it is one of the strongest impressions that a sense can have on someone. This explanation would explain why the protagonist of Fantomina might not have completely thought through her impulse decision before acting on it.