Ordinarily, I believe if your mom has been filing taxes in Iowa for the past two year, you would qualify for Iowa instate tuition, not IN. I’m not sure how it works if you still own property in IN and are paying property taxes. I would suggest calling IU and clarifying with them.
That said, we owned property in another state for a few years but our primary residence was still where my husband was employed and where my daughter graduated HS.