That is a sad situation, but continue leaving that door open. You wouldn't have gotten invited unless she wanted you to come and made a great impact in her life. With my biological son, his "dad" was not invited to his wedding. Son
was under 1 month old last time he saw him. I am still married to my "other boys" dad, but one of my DILs has made a comment on how I will forever be the girls Nana, no matter what. I have no doubts that hunny will be together until at least one of us passes.
You are in a different point in life right now it seems. My hope is that your daughter sees the love you gave her during the time you were allowed to be there.