Easter Egger pullet.
Not a Mottled Java. With that lanky build, it's either an Ancona or Exchequer Leghorn. It is a pullet, though.
Anconas, Exchequer Leghorns, and Mottled Javas do all look the same as chicks. It's when they begin to grow that the differences in breeds becomes apparent. Javas are large, heavy-set birds. Your bird has the slim build of a Mediterranean breed, either Ancona or Leghorn.