I'm a birthmom, and I know this a birthdad's forum. I was just curious from a birthfather's point of view on adoption. I noticed your situation...and I am as well an adoptee.
My parents divorced when I was young and I ended up living with "Dad" (the guy I thought was my father) until one day when I was 17 my mom out of anger called me and said that he wasn't my biological father. I was terribly upset moreso knowing the situation because I was 17, dad just got married, and it was very overwhleming. I had my own problems like school, social life, etc.
Well I ended up getting pregnant a short time after that and my placement with the adoptive parents is more than open.
As far as your situaiton goes, I think you should introduce the idea to her adoptive parents if she knows she's adopted. I don't think blood matters in who you call family, but in cases like this it kinda does.
I placed two years ago so my daughter is only 2 and won't know i'm her birth mother until she can comrehend it maybe around 5 or so.
I think that if your daughter knows she's adopted, introduce yourself, if not...think it over...ask her adoptive couple if everything is going on and if they suggest maybe would be a good time in her life to know...?
then again, like placing a child for adoption, this is all up to you
good luck.