Yeah-- she was pimping Mom, and leaving you none the wiser. So it wasn't really 'consensual' for either one of you.
What I actually find most useful about this particular analogy is that it has a certain SHOCK value about it that jolts others out of what they
think that they "know" about allergies and food, and forces them to consider the kind of actual level of trust/consent that they are demanding so casually from us.