Don’t care.
If she said it on her PERSONAL page and not in any official Delta capacity then she had the right to say it.
I abhor cancel culture in all its forms.
AS much as she sucks for what she did...I agree. The airline should have responded with something like; “While we abhor her message and oppose racism of any type...”
Whether you care or not, the school board has a right, and defined it in their hiring. She agreed on employment. They will win unless she shops around for a Trump hater judge....