She should persuade her audience by including benefits of the trip to Washington D.C, historical facts, and locations. Also, New York can be used to compare to Washington D.C, so there is more opportunity to persuade the audience in going to D.C. I hope this makes sense, i may just me terrible about explaining, but i hope i kinda helped
Are you working on the reference list? What style are you writing? As the variant, you can go to the professional writing service online Prime Writings. No intention to promote it or so. You may just check what they can do for you.
