Nice looking snake! Just a friendly reminder to make sure that the coconut fiber doesnt stay moist. Wet substrate can cause skin problems.
I wouldnt really call her a morph but a "phase" would probably be a more appropriate term. Lets wait until the more experienced herpers chime in on that one. Easterns exhibit much polymorphism and no two look alike. As for feeding, worms as well as thawed fish should do it for now. Just make sure the fish are considered "safe" (this is covered in our care sheet).You can wean her on to mice by slowly adding scented mice to her feedings.

-Neil