"HEY REMEMBER THIS PERSON YOU BEEN LOOKING FOR AROUND 10 YEARS? SHE'S HERE, NOW, DON'T KILL HER, LIVE WITH HER AND GET TO KNOW HERE, WHAT COULD GO WRONG! :)" the logic of this in itself, that's wrong, lol.
Sorry, but no miss admin lady; you do not force a girl to share a room with the murder of her parental figure with the excuse of, "Isn't this a great chance to find out what happened?" I get you're trying to forge an unlikely duo here, but you are really pushing it with the lazy writing.