She is in the same house as James Potter and, seeing as how she's getting along with Sirius, I think she's bound to know the latter's best mate as well. Though otherwise I think they could swing either way, really. She could have a buddy in him, if you will, on whatever basis we can establish; or, unless J beated me to it with Sirius, she could always be an ex-girlfriend or ex-snog (albeit a brief and casual such, if so, on account of Lily's existence and James' persistent pursuit thereof) turned buddy, or some such. Whichever appeals to you, cherished.

As for my other characters.. Isabella Douhan would be in her year, although Ravenclaw, and the two of them are very similiar in a number of aspects. Still, I can't seem to wrap my mind around what could be done with them. Geh. They would probably know each other somehow, though just HOW is debatable, so to speak.. So again, she could be a loyal friend or hated enemy. The choice is, ultimately, yours.

Very helpful, ain't I? >.< Seems more like the point of this message was to indulge my babbly and longwinded nature, or some such.

Anyhow. Among my other characters are Minerva McGonagall, who would probably be familiar with her on account of being her head of house.. and her aside, the rest of my assorted lot are up for whatever plottage you might happen to think of. Hit me up on Y!M (Grand_Exception) if interested.
So Self-Aware, So Full of Shit..