The other thing your vet isn't telling you is that the strips for that pet meter are at least $1 each
One of the main reasons most of us use human meters here is the cost of the strips. Also, we test multiple times a day and at $1 per test, that runs into major money very quickly (or you start cutting the number of tests to save strips and your cat ends up in a hypo or not as well controlled as you can get them)
I'd just tell her that you can't afford it unless she's going to provide it for you (along with strips) and you'll be using a human meter like the Relion Confirm or Micro from WalMart
What we watch for more than exact numbers are "patterns of action".....is the current dose getting the cat where we want them to be? Human meters can do that just as well as pet meters
The protocols we use here were all written for human meters too, so the people here are all used to gearing their advice towards those numbers. A lot of us don't even really discuss our treatment with our vets and just depend on the people here (who have years of real life experience treating sugarcats, unlike most vets who might see a handful of diabetic cats in their entire career)