Normally, you tell TurboTax the type of retirement income when you enter the 1099-R.
So, first you make sure that your state of residence is entered, then when you enter the 1099-R numbers, on a screen or two afterwards, TurboTax will ask you what is the source of the distribution. In her case, you would check off teachers retirement - 02E (or whatever is close to that).
This will cause your wife's retirement income to be handled correctly by Louisiana.