@sbsvwa wrote:
Are we responsible for filing a return this year for those final weeks in 2023 on behalf of her estate, even though the estate is still going through probate?
Yes, if you are the personal representative (e.g., executor).
Note that you most likely have the option of using a fiscal year for the estate's income tax return.
See https://www.irs.gov/instructions/i1041#en_US_2023_publink1000285977
and
https://www.irs.gov/publications/p559#en_US_2023_publink100099754
