After you file

she claimed me on her 2018 taxes but not her 2019. She filed her 2019 taxes late tho, like right before they were due after being extended to like jume or july I think of 2020. So I didn’t receive any of the stimulus. I thought i qualified for the second one but I had the box checked that said “someone can claim me as a dependent”  I saw somewhere I can ammend my 2019 taxes affix that butI dont know how or where to go about it.