As does income. She "sold" the steel at FMV. She "received" that FMV as income and reported the sale subject to sales tax and paid the state.Under Mn state law sales tax extends to 'barter transactions'
She should do the same if @#12 performed HVAC work for her. If she paid in steel, the FMV of the services and payment would be reported as income to the respective parties.
When they come for you, they will be knee deep into your #hit to make it worthwhile when they escort you to your hanging.