My dad's girlfriend doesn't like me?

She's been nice to me and talkative with me since i moved in a couple of weeks ago and out of no where she's having an issue with me and the fact that my dad is building me a room downstairs. She said he's spending a lot of money on it and I'm 99% sure she said to him that she didn't even want me here in the first place. When my little sister mentioned about my room she said "i don't want to hear about her fucking room. I don't want to hear about it" Should I even worry about it? i have to live with her and be around her and i don't like to not be liked especially when i didn't do anything wrong..
My dad's girlfriend doesn't like me?
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