What is Wendy accused of when the private detective discovers her in Steve's offices in the novel, The Wise Women?

When Wendy uses Steve's badge to access his offices, she is confronted by a private investigator who has been sent by a law firm to look into Steve’s product. It is believed that Steve is trying to scam people into investing in a product that does not really exist. The detective then accuses Wendy of being there at her son-in-law’s request to destroy evidence.