The problem isn't that you were fooled, because any of us can be -- it is hard to know what to ask about and what to see, even for longtime cavalier owners --but that a breeder could possibly be this deceptive and cruel. You were the victim, and not at fault.
I also have a mix of rescue/puppy far cavaliers and show breeder cavaliers. A puppy farm cavalier is generally a higher risk dog healthwise because it is unlikely a breeder ever did any testing and they tend to get a poor start in life. But the most prominent show breeder, with a line of champion dogs, can have equally poor breeding practice (and some of them forge MRI and heart scans too -- we have had a case here of a buyer encountering this

).
The difference is not so much between puppy farm or BYB dogs and show breeder dogs, but of properly testing, protocol-using breeders and those who do not. The risk factor is pretty much equal between show breeders and puppy farmers if they don't use health testing and protocols. My most affected SM dog was from a (non testing) show breeder, though I also have a pound rescue cavalier and puppy farm ex-breeder cavalier with milder SM. I have had two show breeder dogs with heart murmurs by age 6 and 7, and a heart-clear show breeder dog going on 9 and two rescue dogs heart clear at 6 and 7.
I'd save all correspondence with this breeder (paper or email) and also, sit down and write down any statements she made that could have been untrue, and the format of the discussion (eg, phone) and the date or week f you can recall.
On a separate note, a CT scan is useless for diagnosing SM -- only an MRI will show syrinxes, and these are very costly (generally well over $1000 in the US for scan and interpretation, more again for treatment and care). I would not recommend getting an MRI unless you are advised to, on the basis of symptoms, by a neurologist. By age 5 or so, about half of all cavaliers will show a syrinx on MRI so the issue is really whether you have a reason to scan -- telltale symptoms on clinical exam by a neurologist, generally. Or in other words -- I would scan for diagnosis to treat a symptomatic cavalier but would not advise scanning just to scan, especially a young dog as younger dogs are far less likely to show a syrinx and this is a progressive disease. As I advised elsewhere, I would wait and see if you see enough to warrant a referral to a neurologist after a vet has checked for likely alternative causes for any potential SM symptoms.

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