She was a series regular in Seasons 2-3 , appearing in several episodes at the beginning and end of season 4 , and was a special guest star in the final series episode in Season 6 , though these scenes were cut from the televised episode . She was a series regular in Seasons 2-3 , appeared in several episodes at the beginning and end of season 4 , and was a special guest star in the final series episode in Season 6 , though these scenes were cut from the televised episode , but appear on the DVD extended cut release .