Documents needed for filing 2020-2025

Family member‘s last filing was in 2019.

She has paid taxes since through a w2 job, just has not filed returns.

Hoping to help her get back on track.

Do we just need to file each year’s 1040? Standard deduction, no dependents or anything. She should not owe anything (I’m pretty sure).

Just want to make sure there aren’t any other documents needed for late filing.

also, can I mail them all together if they’re clearly separated.

thanks