By: Jessica Goddard Mary Shelley is an appropriately dramatic and sentimental depiction of the early life of 19th century writer Mary Shelley (Elle Fanning), as well as a satisfying exploration of Shelley’s influences in writing her now-classic novel, Frankenstein.  The film focuses heavily on the arc(s) of Mary’s relationship with her eventual husband, Percy Bysshe Shelley (Douglas Booth);  always emphasizing the ways in which Mary’s famous Gothic novel is affected by the various traumas of…