Originally Posted by
dontknownuthin
One action or failure to act does not make you a "bad" daughter. It does mean that you were inconsiderate and thoughtless about your mother's birthday this year. It's not too late - get or make her a card and say something sincere and kind in it such as, "So sorry for my thoughtlessness in not recognizing you on your birthday. I should not have taken you for granted. I love you and I appreciate all you do for me throughout every year."
As for her not remembering you on your birthday, if it happens again I think that it is appropriate to tell her, "It hurts my feelings that you don't think of me on my birthday. I was thoughtless about yours, too. Can we not do that to each other any more? I think we can do better."