The one-finger salute is associated with Islamist groups like the Muslim Brotherhood.
I believe that this is her daughter; she has other photos of her with jihadist slogans.
What do you think she teaches her students?
"The #intifada of Ramadan" (meaning July 2014. Yes, UNRWA teachers were calling for a new intifada last year too,)
And she recently changed her cover photo to this peaceful image:
"Strike (i.e. throw) and from your hand the rain will pour down"
(h/t Ibn Boutros)