She was.
Black hair in a ponytail, messy bangs, blue eyes, patched blue sweatshirt, and tatter red shorts. She didn't look like much.
That fact did not deter Kaneki from buying a bento from the convenience store down the street, opening and declaring it to be out of date, before setting it near the dumpster. His co-workers (excepting Touka-san) just gave him the oddest looks before shaking it off as a half ghoul thing. Hopefully the homeless girl would be curious enough to go back into the alley when she saw him walk out the front door instead of just throwing it out the back entrance.
Anteiku didn't have any more dated cakes, and nobody needed to eat just cake anyway.
He didn't get to watch the girl eat it, but when Kaneki left for the night the convenience store bento had seemingly disappeared from where he had placed it.
It continued to disappear each day he brought one. Meanwhile, he stopped pretending to even be interested in the bentos. Kaneki's co-workers thought he was strange enough as he was. There was no need to make them gag at the thought of what he may or may not be eating.