Guest Stars Lily Rabe as Joan Barrett Co Starring Pearl Amanda Dickson as Teen Syd Violet Hicks as Young Syd Audrey Lynn as 6 Year Old Syd Dave Baez as Isaac Lily Keene as Mean Girl #1 Holly Hawkins as Cheerful Woman Spencer Ward as Jason Curtis Webster as Doctor Chloe Ernsberger as Singing Girl #1 Victoria Clare as Singing Girl #2 Lola Raie as Singing Girl #3 Jena Allen as Mean Girl #2 Emily Hoffman as Mean Girl #3