Kate Mazz theory:
Assuming Q intel and counter-intel are working on many levels, it stands to reason there are probably connected white hat 'anon' players like Kate. Deploy as necessary to create the proper counter narrative. In this case, QAnon followers are not about violence, they use their wits and do the right thing. Whether the man stalking the prez was real or not, doesn't really matter. White hats like this could be robo-trolling twatter looking for MK-ultra type personas, just like the black hats would do.
She seems 'trained' to me. Military, law enforcement, etc. Anon $.02.