should of had a litter out of her already, id put a good saluki,bull,bedlington,wheaten,whippet,collie,kelpie,deerhound, greyhound over her should have plenty of stamina from the saluki , good feet from the collie and kelpie not to mention the ease of training , plenty of fire from the terrier breeds , and make a good size because of the deerhound ...
failing that id wait a couple of years while working her hard and also try finding a dog which you'd like a pup out of and go on your own opinions and not that of someone elses