The Great Laura Debate! Who really is Laura from Silent Hill 2?

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Mary wanted to adopt Laura, which generally means that she would know if Laura had parents or not. This leads to the idea that Laura was an orphan at the hospital, or was admitted there with her parents and the parents expired.

According to Lost Memories about the kick opening scene:

17 Laura gives Eddie a kick while he sits on the street. This scene indicates that the two of them met by chance on the way to Silent Hill.

Also, about Laura in Lost Memories....

A young girl who was a patient in the same hospital as Mary. Having no mother of her own, Laura loved Mary as if she were her real mother.

Her name is taken from the nonfiction work "No Language But a Cry" by Richard D'Ambrosio, the story of a young girl's search for happiness while struggling to overcome the scars of abuse.

Of all the characters, she is the only one who does not hold any darkness in her heart. It may be that she came to Silent Hill looking for Mary. To her the town appears normal; she does not see any monsters, nor does she see Maria.