Evil crazy stepmom is ruining my dads life!!?

My dad has been married to her for 7 years and at first everything was fine. I visit him on the weekends so growing up i didn't really spend much time with Paula and as far as a 10 yr olds perception goes i couldn't see any problems. Then she started getting crazier and crazier. she brought a little white dog named buffy into the family which she adores a little too much. She cares more about her damn dog than anything else including my dad. She constantly worries about everything like when she's outside she worries about bugs flying at her or when shes home alone she has to have the lights on at all times if its dark out. She hates going in the basement and being in the dark. The list just goes on and on. And for the past 6 years everyother time i come over they fight. And shes so immature about everything I mean one time my dad tried being really nice to her and gave her a surprise birthday party and had her best friend fly in. That night she was screaming in his face because she hates being the center of attention like that. She hates me too (she hates kids in general) she hasn't given me much respect ever. And my dad has always only had me to talk to about these things and his family is crazy and my mom wasn't too nice to him (she played a lot of mind games and holds grudges I've seen it first hand) and i always felt i was the only one that could make him happy and thats been going on for idk how long. and Idk something snapped recently and now i'm super mad whenever i come over. I'm mad ALL THE TIME. It was like that for a while but never this bad. I used to just ignore her and her antics about buffy and everything but now i'm just tired and willing to confront her about it. I'm done giving her my respect. I gave her all the respect i had its just gone... And now i'm more rebellious than ever there too and I love my dad i really do. He is the best thing to ever come into my life but I'm so angry all the time that our relationship is falling apart. Anyone out there with the same problems? Any comments to help? I'm at the end of my rope here. thanks for reading all of this :D I just needed to get it all out i guess