Whether you agree with it or not (I don't, but I also don't agree with this woman's views and understand why parents wouldn't want her near their kids), teachers in FL can be fired for shit they say on Facebook if it's public. I taught in FL, and it had a stricter ethics clause than my current state by far. This was in the earlier dawn of social media, but we were basically told to stay far away from that in my first district training there (my current district doesn't GAF and lets us be people with much freer speech).

Perhaps relevant part of ethics clause:

(c) Aware of the importance of maintaining the respect and confidence of one’s colleagues, of students, of parents, and of other members of the community, the educator strives to achieve and sustain the highest degree of ethical conduct.

It's worth noting that the teacher hasn't been fired and is getting due process (a paycheck with an investigation; being re-assigned to admin duties is not a massive punishment) within the district, which is more than lots of FL teachers have gotten for things they said on social media. If she's part of the union in FL, they'll likely rep her, just like anyone.

Depending on her contract status (FL did away with tenure, I think, so no idea if she has it, but she looks rather young for it), there's every likelihood they could keep her on payroll for the rest of the year (with administrative testing duties or something in this season -- she teaches a specials course, it seems, so that was on the menu anyway, I'd bet) and then just let her go within contract norms. Of course, I have no idea. They may also terminate her. She may also be vindicated.

But a lot of people don't know about FL's overly strict ethics clause or that many states have similar clauses for teachers. It's absolute bullshit to have them, but I didn't hear a bunch of conservatives speaking out against it when it was used to root out people they thought were corrupting their Bible-thumping kids.