Oh yeah, I forgot about DH, but I'm sorry, no. She doesn't know him before school in my story.

Chapter Seven: Severus Snape

When Transfiguration ended, Lily, James, Remus, Sirius and Peter left the classroom and James asked Lily, "Lily, what if Dumbledore didn't make a mistake? What if we are going to be together, get married, have kids, and die for them?"
"It's kind've scary just thinking about it!" said Lily, "Can we please stop talking about it?"
"Fine." They met Keely outside the Great Hall for dinner and she said, "I'm so glad Potions is over! I thought it would never end!"
"Why, what happened?" asked Sirius.
"Slughorn had everyone get partners and when there was nobody left, I had Severus Snape!" James and Sirius's eyes opened with shock and Lily asked, "What's wrong with that?"
"Lily, the kid's a freak." said Keely, "And he's in Slytherin, can you find nothing wrong with that?"
"Just because he's in Slytherin doesn't mean there's something wrong with him!" Lily said defensivly, she looked at Remus and said, "You think that too, don't you Remus?" Remus didn't answer, he just shrugged and said, "Lily, maybe Keely's right."
"I can't believe what I'm hearing!" Lily strided angrily away from the group and into the Great Hall. She didn't see where she was going so she accidently ran into someone. She looked at the person she ran into and said, "I'm sorry about that, I should've been more careful." She suddenly saw that the person she ran into was Severus Snape. The books he was holding fell out of his arms and onto the floor. He bent down to pick them up, "No, the fault was mostly mine, I was too busy with these books." Lily bent down to help and asked, "Why do you have so many?"
"I have a lot of homework, especially in Potions. It's not exactly my best subject." Lily picked the remaining books off of the floor and handed them to Severus, "I can help you with it, it's one of my best subjects."
"That'd be great," said Severus, "Only one problem though."
"What?"
"I don't even know your name."
Lily smiled sheepishly at him and said, "I'm sorry, I forgot my manners. My name is Lily Evans. I already know who you are, though; Severus Snape. I've heard about you."
"I suppose what you've heard about me aren't exactly kind. Am I right?" asked Severus.
"I'm sorry to say it's true." said Lily, "But I never really believe in any of it."
"That's good. So about you helping me in Potions, I'd appreciate that. Tomorrow will be a great time since it's Saturday."
"Okay, tomorrow after breakfast by the lake. Think you can make it?"
"I think I can. It was nice meeting you. And thanks." Severus walked out of the Great Hall while Lily walked over to the Gryffindor table. To her surprise, James, Keely, Sirius, Remus, and Peter were already there.
"We saw you talking to Snape." said Sirius.
"Why? Is that such a crime?" asked Lily
"Yes." Sirius simple said. Lily ignored this comment and Keely said, "Hey. James. It looks like you got some competition!"
"It's just Severus Snape, Keel." said James. Lily ignored the group. Remus leaned towards Lily and whispered, "I think Keely might be right, though."
"Remus, what on earth are you talking about?"
"Well, I've seen the way he looks at you and I can tell it's a look of longing." Lily couldn't ignore this comment, she suddenly remembered how Snape sometimes looked at her when they were in classes and couldn't help but think that Remus was right.