Who came to visit after delivery?

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So I saw my MIL invited someone to come visit in the hospital when my daughter is born. Someone I don't know. She said it on FB, so I didn't say anything to her. We're already in a little fight right now, but how do I casually explain that I only want immediate family there when my daughter is born?
She is annoying me SO badly right now, and is so sensitive. Last time I spoke to her she hung up the phone crying 🙄 but she's just always butting in. My SO told me that we need to handle it bc it's our business.