That is sarcasm right? the term is not in the constitution.
a quick google search yields this from wiki, http://en.wikipedia.org/wiki/Separation_of_church_and_state
The concept of separation of church and state refers to the distance in the relationship between organized religion on the one hand and the nation state on the other. The term is an offshoot of the original phrase, "wall of separation between church and state," as written in Thomas Jefferson's letter to the Danbury Baptists Association in 1802. Jefferson was responding to a letter that the Association had written him. In that letter, they expressed their concerns about the Constitution not reaching the State level. The Fourteenth Amendment to the United States Constitution did not yet exist, thus leaving the States vulnerable to federal legislation. In Jefferson's letter, he was reassuring the Baptists of Danbury that their religious freedom would remain protected - a promise that no possible religious majority would be able to force out a state's official church. The original text reads: "...I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, or prohibiting the free exercise thereof,' thus building a wall of separation between Church & State." The phrase was quoted by the United States Supreme Court first in 1878, and then in a series of cases starting in 1947. The phrase itself does not appear in the U.S. Constitution, although the First Amendment of the Bill of Rights states that "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."
The concept of separation has since been adopted in a number of countries, to varying degrees depending on the applicable legal structures and prevalent views toward the proper role of religion in society. A similar principle of laÃ¯citÃ© has been applied in France and Turkey, while some socially secularized countries such as Norway have maintained constitutional recognition of an official state religion. The concept parallels various other international social and political ideas, including secularism, disestablishment, religious liberty, and religious pluralism. Whitman (2009) observes that in many European countries, the state has, over the centuries, taken over the social roles of the church, leading to a generally secularized public sphere.
so in essence when she says "where is it in the constitution" she is correct, but these genious law students are so smart, they must be right.
it is called legislating from the bench, and the courts activist interpretation of the phrase
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."