Did I do something wrong to her for her to say I want to be alone?

So me and my girl been talking for a year now. We had our ups and downs but mostly ups. This past weekend we went to see her parents at their place for a cookout. Stay over at her place and the next day went on a picnic. Next day, I had to go out of town for a week to work. So I called and we talked for 30 minutes. Even at her to go to an escape room when I come back Saturday. She accepted and was excited. Prior to calling, she got into a bad argument with her son’s father. She already in a mood because she was drinking and it’s the time a the month. So when we were talking, he called and she said that she’ll talk me back. I called back an hour later to check on her. She was in a pissed off mood. She said that she wants to be secluded from every one including me. So we haven’t talked since Monday. I message her son asking if they are okay. He said yeah and he said that she’s not mad at me but just need alone time is what he overheard her say on the phone.

I’m not sure why she’s taking it out on me for something I didn’t do. Why is that?

Did I do something wrong to her for her to say I want to be alone?
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