My partners neice, am I overthinking it?

She came over yesterday to stay the weekend and had barely said a word to me, today my partner was at work and it was me, her and my son and she stayed in the room the whole time and only spoke to me a couple times but it’ll be a few words then back into the room, there was a couple times where I spoke to her to try and make conversation but she would just ignore me. I told my partner I feel like she hates me now for some reason but he said I’m overthinking it. Normally she’s fine with me we have always been close, she’s 12 could it just be a teenage thing and I’m overthinking it? I don’t want to ask her incase it makes her uncomfortable. I’ve been in her life for almost 6 years so it’s not like I’m a stranger.

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