"Lily Potter. GRYFFINDOR!"
-- The Sorting Hat and Lily Potter (CC1.4)
Lily Potter boards the Hogwarts Express on Platform Nine and Three-quarters at King’s Cross, is sorted into Gryffindor House and starts her first year at Hogwarts School of Witchcraft and Wizardry (CC1.4).
Her brother Albus may have had a small hope in his heart that she would join him as a Slytherin, but his friend Scorpius Malfoy reminds him that “Potters don’t belong in Slytherin”, to which Albus replies “This one does” (CC1.4).
From the Web
Pottermore: Harry Potter and the Cursed Child
The theatre production opened in the West End of London at the Palace Theatre on 30 July 2016, with Zoe Brough, Cristina Fray and Christiana Hutchings alternating in the role of Lily Potter Jr: Harry Potter and the Cursed Child, Parts One and Two