It sounds like your stay with your friend is nothing more than like if you were renting a hotel room for work while traveling?
If you are only staying in MN for work during the work week, but actually live in Iowa, then you should be filing an Iowa Resident Return and a Minnesota Non-Resident return.
If this has been the situation, then you will need to go back and amend your MN returns to a non-resident return and file for the first time your Iowa returns if you haven't filed any yet.
To do this if you used TurboTax you will need to follow these instructions to Amend Your Return . You will not need to change anything on your federal return, just add a state and amend the other state.
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