Bedlington x Whippet - my favourite type of lurcher and oh so versatile for working. I've know them to course, flush and retrieve as well as win agility contests. Personally I don't think you can better that cross so putting her to anything else simply isn't necessary.
That said, you obviously like the lurcher / long-dog shape so your best bet could be to put her to another whippet based lurcher. (The different combinations are endless).
Alternatively you could put her to a something like a short haired fox terrier, that should give you a slightly more stocky dog or an Italian greyhound, that should give you a smaller thinner dog.
Trouble is, once you start crossing crosses you never quite know what you'll end up with!