See if your sisters cam has a macro setting...it's usually represented by a "flower" on the button or setting.
Definately looks motley, and if it has a plain white belly (no checkers) it's 99% certain. Motley add a hypo-ish effect also, so whether or not it's hypo is a bit harder to tell. As it get olders and develops more of its adult coloration you may be able to get a better idea visually.
Very nice looking snake; if the corn bug bites you you can always breed it to a hypo or any other morph corn thats has hypomelanism in the makeup. If the babies are hypo's you'll know "for sure" ;*)