Well, floating ribs is just the term for the last rib/s that don't connect to the breastbone, which a lot of dogs (and I believe all humans) have. Your vet probably just meant that your pup's stick out a little more than average, which may well be because she's a long-bodied breed. It's not anything unusual or dangerous.
Yeah, I can see how the terminology could sound ominous if you don't know what it's referring to! I can feel my poodle's floating rib (he's six) but certainly can't see it, even when he's shaved short.
Yeah it was confusing to me especially hearing there was no treatment.. I’m so relieved to find out she will be okay though ? I’m guessing since she’s short haired & has a long torso, it’s more obvious to see because my long haired Doxie doesn’t have them.