Who is Eileen Prince?

Quote	Source
Harry picked up the crumbling piece of paper and stared at the moving photograph, yellowed with age; Ron leaned over for a look too. The picture showed a skinny girl of around fifteen. She was not pretty; she looked simultaneously cross and sullen, with heavy brows and a long pallid face. Underneath the photograph was the caption: EILEEN PRINCE, CAPTAIN OF THE HOGWARTS GOBSTONES TEAM.	Book 6, Page 537 Half-Blood Prince, Chapter 25, "The Seer Overheard"
"It's just that I was right about Eileen Prince once owning the book. you see ... she was Snape's mother!" ... "I was going through the rest of the old Prophets and there was a tiny announcement about Elieen Prince marrying a man called Tobias Snape, and then later an announcement saying that she'd given birth..."	Book 6, Page 637 Half-Blood Prince, Chapter 30, "The White Tomb"
...a hook-nosed man was shouting at a cowering woman, while a small dark-haired boy cried in a corner.	Book 5, Page 591 Order of the Phoenix, Chapter 26, "Seen and Unforeseen"

Links:
Fan Art of Eileen and Baby Severus