First off, I'm really sorry to hear about your father dying recently - I can imagine that's been very difficult to deal with.
Secondly, what the girl said is complete and utter bollocks - assuming that God exists, that isn't how it works at all (see various passages about God being loving, compassionate etc.). None of us really understand why things have to be the way they are, but trying to pin tragedies on the idea that God hates a person is the kind of logic from the Dark Ages. If that girl truly is Christian, she should know better.