Filing for mom and her estate

Mom passed away in late Nov of 2019.  She had been receiving Soc Sec, dad's VA payment and she supplemented income by drawing on an annuity. After she passed, I set up a new Trust Account and had all her assets from Charles Schwab moved into new account. Liquidated the remaining amount in her annuity as well.

Question is (or please confirm), that I am I filing an individual return for mom like I did in the past years for her SS, VA and annuity payments AND also filing a return for the new trust set up? My biggest confusion is reporting the assets from Charles Schwab since end of the year dividends/capital gains were paid in Dec after her death and some were posted to the account prior to me setting up the new trust and some came after. I am assuming that it doesn't matter when they posted because it was all after her passing and all that goes into the new Trust's return. I think I have that right? Thanks for any input.