Received 1099-R for Deceased Parent

My mother passed away in December of 2020.  I received a 1099R in 2022 for 1 month of disability income that she received in January of 2021.

The 1099R is in her name with a code of 3 for disability.  The money from January 2021 was deposited into a checking account in which my brother and I as well as my mother were on.   

 

What do I do in this case?  Her taxes for 2020 have already been filed, not sure how to claim this income?  This is the only income that was received in 2021.  

 

Any\all help is appreciated, happy to answer any questions.

 

Thank you so much for your time!!!