What can I say without libeling?

A certain person previously admitted to me that she intends to lie on a college application. The college (a christian college) allegedly asks applicants (according to her, at least) whether or not the applicant attends a church regularly, or has partaken of alcohol. She intends to lie on these questions, saying that she attends church regularly and has not partaken of alcohol. I hope to possibly write a letter to the college with the intent of making these wrongs clear. I do not intend to necessarily jeopardize her admittance, merely to right these wrongs. What I am afraid of is that I might be accused of libel or harrassment. What would I have to have to back myself up? What might I face for saying this if I cannot prove myself. Thank you very much for your help.

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