Unfortunately, that family is not as open as we are to openness in adoption, so we have not managed to get the sisters together. (The primary sticking point is that there is a younger brother who was born after the girls came into state care. Ashley knows about him and the older sister doesn't ... and her family doesn't want her to find out. Ashley adores this brother and sees him often. There is no way to guarantee that she won't mention him if we get the girls together.)
Ashley feels a connection to this sister, but standing in the card aisle today, it was painfully obvious that many of the choices would not do for our situation. Any cards with references to "the great times we share" were out. This one would be perfect, she said at one point, if I could add a "d" -- in other words, change the tense from present to past, as in "the great times we shared."
We eventually found a card with a simple message that basically just said: "You are awesome, Sister. Happy Birthday!" It will do for now, but I hope that someday their relationship will again be present tense.