Let's make a distinction here: she doesn't get to see invoices to me from my vendors, but she's the contact for payment of invoices so she definitely sees my invoices to the client. So, yes, the percentage of profit is buried where she can't see it.

Just as nobody asks the grocer how much the grocer paid for those tomatoes, and nobody at the market would tell them, nobody finds out from me what I pay for products. I have, however, had people want to see the invoices to me from vendors.