Deductions & credits

I am the executor of my mother's estate, and closed on the sale of her house 5 months and 21 days after her death. The house sold for 155,100. If I use that price as the FMV for both the time of her death and sale price, TT business wants to use the 10,200 in closing costs as a capital loss. But, a previous answer said this was not right, as it was her principal residence. It was not used during this time, only emptied and cleaned.