Whatever she is, she's 100% sweetie!
The best dog-DNA test on the market is still lacking identifiers for many breeds, including, IIRC, most of the bullies (APBT, Am Staff, Staffies), so those mixes don't ever show up.
And we always like to assume our dogs are 25%, 25%, 50%, etc, of whatever breeds, but the mixes are often much more diluted than that. A mix breeds with a mix, so on and so forth.
Catahoula only really makes sense if you're in the southeast, otherwise they're pretty rare dogs. It's safe to rule out the other more exotic breeds, like Vizsla and Pharaoh Hound, as they're really not common, so unlikely to be found in a mixed breed dog.
My guess is predominantly Lab, northern breed (some Husky-type), and bully breed. The fair nose and lips can be found in most pigmented dogs (it considered a fault in most breeds according to breed standards) so I wouldn't assume an exotic based on that alone.
She's wicked cute, regardless!