My mother passed away in the middle of 2021 and I was the executor of her estate.
The estate value was about $1,000,000 including the sale of her home and was distributed to a number of people.
What do I need to file for her, for her estate and do I need to add anything to my personal return?
I am sorry for your loss.
You should absolutely seek professional tax guidance from a local professional and, possibly, legal counsel.
For starters, you might want to read through the following IRS publication if you are the personal representative.
https://www.irs.gov/publications/p559#en_US_2021_publink100099488
I highly recommend you seek local professional assistance if you are unsure of what to do ... you may need to file a final personal return for the decedent as well as an estate return depending on the circumstances.
You may wish to review this resource for more tax guidance about your situation: Death in the Family.
For full details, see IRS Resource: 2020 Publication 559: Survivors, Executors, and Administrators
I am sorry for your loss.
You should absolutely seek professional tax guidance from a local professional and, possibly, legal counsel.
For starters, you might want to read through the following IRS publication if you are the personal representative.
https://www.irs.gov/publications/p559#en_US_2021_publink100099488