Allowing tax credits to be shifted to AZ STO orgs does nothing to violate establishment.

First, not every private school is a religious school (number in AZ hovers at about 75% religious affiliation).

Second, on "establishment"...the credit is at the liberty of the individual contributor, who is free to choose amongst several STO organizations..and if that individual so chooses, can contribute to a non-denominational organization.

So, she is wrong. School choice is not an establishment case, at least not in this instance.