Movie about a girl being trained as an assassin? Not state of Play?

A girls house is being robbed (she's really young maybe like 12?) and her brothers hiding Under the bed but gets stabbed by a robber on top. He survives but the sister dosnt know, the whole time an assassin dood who's good I guess is watching in secret. So she persuades him to train her. He also sleeps with sunglases on next to a lamp. Can anyone tell me what movie this is? Thanks!