Plus your own additional time researching, and the $100 (+) is a 100% probability, whereas the $800 is a tiny probability, at best.
I'm saying pay it to the mother effectively as the executrix, not as the beneficiary. (It's not eligible for rollover since there is not a named beneficiary; she can waive the WH.) Suppose there's another estate beneficiary...we know that there were funeral expenses that are costs to the estate that would eat this money up, so nobody is netting anything out of it anyway.
Ask me tomorrow and I might have another opinion, but today it seems silly to do otherwise.
P.S. I don't like the plan language naming the estate as the default; it's basically not making a decision which in turn makes things harder when you wind up here.