Ignoring the fact you probably don't have a pedigree... what were you expecting from a pitbull? short, stocky, thick and 100lbs? What you described is an APBT... leggy, lean, FAST and around 45lbs. Despite not having a Ped. I would say she is all APBT she is only 9m/o and looks just like one. But like most have said... you may never really know unless you can get a pedigree from her breeder.