all that matched with your dog and the rhodesian ridgeback is the color. The rhodesian ridgeback is too big and the ears are too long, PLUS the back of your dog looks NOTHING like this.
i deff agree on the greyhound or whipped since she is incredibly fast. and her back does raise up like that from time to time.
my gf broke out her dog book (750+pages, 1 of 2) and its looking like there is a little greyhound and whippet in your dog with some terrier (possibly american staffordshire terrier) plus some beagle