I think that your analysis is fairly strong. I am not a big fan of the opening statement. I am not entirely sold on the "top man down to the bottom" as a way to open the paper. You might have to include this as part of the task requirements, but I am not a big fan of this way of phrasing and the idea that the "bottom" of society lied on the same level as the top of it. I think that the ruling elite of Salem had much more to gain than the lower level of society. It seems to me that this opening might need modification.
I do think that you might be best to curtail some of the emotional explosiveness of the language in describing Abigail. The "evil- minded" element is going to be a challenge to prove because it is so emotionally driven. Perhaps, using a term such as "destructive" could be better. There is an easier case to prove Abigail's destruction in the drama. I would also examine the sentence about Abigail's childhood. The idea that she only values her own "life" might not be something that is entirely evident from the witnessing of her parents' death. Miller's construction of Abigail is one that shows when children have to witness and experience such trauma as children without a sense of guidance and nurturing after it can turn out emotionally confused and unsettled in a psychological point of view. I think that this might be something to examine. Finally, I do believe you are right in your analysis of why she does what she does for John Proctor. Yet, I think that there might be a love of power that exceeds her love for Proctor. At the trial, I think that there is a clear embrace of the power that Abigail is gaining as a result of her accusatory ways. In the end, her love for Proctor might have started all of this, but I think that the love of power was something even more seductive for her.