My old dog hate our new puppy, help?

So I have a blue nosed pittbull, she is about 6 and we just got a baby boxer puppy who is 8 weeks, My older dog hates him, and she is ignoreing everyone in the family she won't snuggle and when I pet her she started to flip out. She sometime refuses to come up or down the stairs or even go on any couch, and she now sleeps in the bathroom meanwhile she loves to sleep on a bed, I don't know what to do, Help!!??