Re: My cat attacks my dog for seemingly no reason. Help?
Welcome, and I'm not sure...I think you are on the right path with the scent thing, but her behavior almost sounds like misdirected aggression or re-directed aggression. ...and this is probably not due to the dog, but due to the strange cats she can see/smell in the yard. She cannot attack them, so she attacks the next-best-thing, which happens to be Braxton.
I'm sure there are some things that can be done to help this situation, but I've never experienced it so I have no advice to give. Hopefully someone else will read this and have some good ideas for you.
Best of luck,