(written from a Production point of view)
According to background material created for Star Trek Generations, Sarahd was an Andorian ambassador and the first vice-president of the United Federation of Planets. She signed the Federation Charter in 2161 after a scuffle with Ambassador Natha Kell of Tellar.
This information comes from "It's Federation Day!", a newspaper clipping which was placed in the Picard family album during the filming of Generations. However, none of the clipping's text was seen on-screen and is therefore considered non-canon.