did you add her to the title on the property. if not since she is not an owner any interest she paid would not be deductible unless she could properly claim equitable ownership.
equitable ownership factors include having the economic benefits and burdens of ownership
does she live in the house
what portion of mortgage does she pay
what other expenses of maintaining the home does she pay
who pays the taxes
there is no one determining factor, so you may want to get professional advice from a later
