Why does my cat hate me all of a sudden?

I got this cat (calico) almost a year ago and we have had another cat (Maine Coon) for a couple of years. So when I got this cat she was in quarantine in my room and we got her declawed so she was recuperating in my room so she was in there for about a month before we let her out.. Then we let her out and the bullies the other cat a lot. She would come up to my family and we would give her attention and the would like it and purr. She will go in my sisters room and she will run out of my room if we put her in there. She is supposed to be my cat but she will not sleep in my room. But lately the past 2-3 weeks she hates me. She doesn't hate my family she just hates me. When ever I get close to her she will scream really loudly and she would hiss and try to bat at me and then she would run away. I have tried to get her to like me but she just does the same thing. Every time I try to get close she will also poop and urinate all over. I have no idea what I did to make her so mad, it isn't like I have done anything like through her around or hit her or anything. Please help tell me why she is doing this and how to make her like me again. Does it have something to do with the declawing and she associated my scent with the pain? But then again she would have always hated me and she liked me for a couple of months after we let her out and it wasn't until recently that she started to hate me.