I guess the first thing that comes to my mind is: was she this bad before your dad died? If not, has she had councelling because it really sounds like she has not dealt with this properly. She takes her anger out on whoever is closest to her and that would be you. Most likely she doesn't realize what she is doing. Could you convince her that the both of you should go to councelling (just so, you know, your not "a bad daughter").
I am sorry to hear about your losses lately. The best of luck to you!
Hugs,
umotard

People know a little about everything and alot about nothing.