Do I file using SSN or EIN or both? Mother died April 2017. I received a SSA1099 and sold her house (her only asset). I also have an EIN for her estate.

I am unclear on filing for my mother's estate.  She died in April 2017 at age 90.  I have SSA1099 as her only income.  I an personal representative for the estate.  I sold her house for $170K in November 2017.  House was purchased in 1964 for $25K.  Estate has only one claim against it and I have some expenses to pay out of the proceeds.  Then the rest can be distributed to the people identified in the will.