The goovernment--in this case a public school--has no right to underwrite it either, and yet they did.
There's plenty of real overreaching by the ACLU. Don't blow your case by defending this conduct as appropriate.
Fifi, a FORMER student did whatever it was she did in front of a bunch of FORMER students who are adults under the law. Further, whether you like her religious beliefs or not, they are hers, and if she was to give the allowable prayer, it's up to her to do whatever it was she was going to do and NOT up to the state to writer her a prayer.
The Supreme Court prohibited such things long ago.