Let your daughter know that as a teacher, she has the right to opt out of supporting union dues that support liberal causes. From what I understand, she still has to pay dues, but her dues go to other than liberal causes.
Do a google search on "opt out teacher union dues." See which results are appropriate for your daughter. I think it varies from state to state.
This option is one of the items the unions try to keep secret from their teachers. Imagine how many teachers would opt out if they knew they could!
I believe that its still mandatory to pay a collective bargaining fee to the regular union, but dues beyond that can be opted out of so as to not support the NEA's left-wing agenda.