The way Red Flag bills work for States that have them is the Miami FBI could have flagged her that would have kept her from being able to purchase anything in CO to include ammo.
Somebody in FL would've had to report her as being unstable first to get on that list.
You saying the FBI would be the ones reporting her? Then a local judge decide if she's nuts?
The FBI taking it upon themselves to flag anyone who posts crazy shit on the internet means we're all screwed.
Unless that judge is also a psychiatrist they're not qualified to make that sort of judgement either.