In her seventh year Lily was made Head Girl and began dating James Potter.
After Hogwarts she married James and they had a son, Harry James Potter, of whom she made Sirius Black the godfather.
James's best friend Sirius Black later commented that James could not resist showing off and making a fool of himself whenever she was around. While she did not approve of his bullying, she did admire how James stood up for his friends and other people who were cruelly treated by Snape's aspiring-Death Eater friends.
During their seventh year, James matured somewhat, proving himself to be responsible and brave.
However, they were apparently better off, since Petunia sneered at Snape for coming from that poverty-stricken neighbourhood.
Severus was the first person to tell Lily that she was a witch, and he went on to teach Lily a great deal about the wizarding world while the two eagerly awaited the time when they could attend Hogwarts School of Witchcraft and Wizardry together.
Living off James' family fortune, the Potters became full-time members of the Order of the Phoenix, an organisation dedicated to fighting Lord Voldemort and his Death Eaters, along with their friends Sirius, Remus Lupin, and Peter Pettigrew.
which presumably took place over Christmas break, as they were both still at Hogwarts.
She became quite skilled at Potions, attracting the attention of Professor Horace Slughorn, who made her a member of his Slug Club.
In her fifth year, Lily stood up for her then best friend — Severus Snape — when he was being bullied by James Potter, whom she considered to be an "arrogant bullying toerag".
Sometime after graduating from Hogwarts in 1978, Lily and James married, the wedding took place sometime between the summer of 1978 and the autumn of 1979, with Sirius Black serving as James' best man.
Lily had little contact with her sister from that point.