Because saying you do not need a TUE (which how does a UFC Dr. think you don't?) does not mean you can hide treatment. They ask you to disclose everything. As I already pointed out, fighters have disclosed banned substances because they thought it was fine to take them. Cyborg literally hid everything. Then a UFC Dr. swoops in. Even if she thought she did not need a TUE she still knew she had to disclose because you disclose EVERYTHING even things that are alright to take.
The only actual reason to not disclose is to keep USADA from knowing about it, and the only reason she would want them to not know is if she thought it was not allowed.