Where They Stand- Sorcerer's Stone With a Twist

This is another version of the Sorcerer's Stone. When Harry meets an odd girl when he is none he considered her to be his first and only friend, so of course he was happy to see her two years later at the zoo. Of course Harry wouldn't know of her being a witch, but what happens when he fonds that she is, she's not a Gryffindor either so how will their friendship exactly work?