Update.

She and the mistery boy (she took a liking to calling him that) crossed paths twice more so far.
One time, again, on the bus. She saw him, and realized how unavailable she seemed, reading a book and listening to music.
She saw him sit down, not on one of the bus' seats, but on the steps. Luckily one of the doors of the bus was broken and he had that space to sit, or he'd had been trampled to death. She couldn't stop looking at him, she found him interesting... Besides, he had a cut off white shirt with funny words written on it, looking like it was made for him or by him.. she liked the detail.
She felt guilty for having a chair and did a good deed by giving it to an old lady that got on the bus, and he turned to look at her for a brief second.
When he was getting out, his bag got stuck on the bus, and she tried to help him with it, but he went for the more phisical approach of pulling on it till it got free, almost breaking her nail on the process. Thankfully, he didn't, or she'd be forced to hunt him down and kick him.
She left him behind again, this time walking normally.
And then she saw him yet again, this time with a black and white shirt, and he seemed to have the hat glued to his head, he always wore it, apparently.
She saw him walk by, and smiled at her sillyness...
She liked the possibilities of just being able to imagine almost everything about him...
She was definitely a weird one, but like she told a friend, she was just a compressed file, and not many were able to decompress her properly.