Cash transfers of bank / credit union balances: $1,008.64
Returned check (past due rent, etc. Spearman House) $2,000.00
DPS Retirement Payments (Jul 2015 – Jul 2016) $6,640.27
USAF Retirement Payments (Jul 2015 – Sep 2016) $10,684.52
You did state that your father took his full pension amount (knowing that the judge had ordered it split) until the QDRO went fully through. Therefore there is at least an argument to be made that his estate is responsible for her share as a debt of the estate.
I realize that your dad did that because your mom was fully using that particular pension during the period of time it took for the divorce to go through and be finalized, but that doesn't change the fact that it can be argued that your father was legally required to pay her, her share of the pension until the QDRO was formally done so that she could be paid directly.
Clearly you and your sister have opposing viewpoints as to whether or not your mother is entitled to that money...and to me, both of your viewpoints have some merit.