What would you do?

So I need to rant! Lol so I'm 25 weeks pregnant my husband and I tried for over 6 years and finally got our little miracle! Well my mother in law and my husbands 2 aunts decided they wanted to throw me a baby shower. They are renting a building that only holds 75 people. Which is fine so we invited our close friends, My family and my husband's family which put us over 70 people. My sister in law Mother-In-Law messaged her the other day wanting to know why she wasn't invited to my baby shower. Mind you, I have only ever met this woman, maybe three to four times and don't really have any connection to her. I barely know this woman so my sister-in-law told her that there was too many people already invited and that it was family only. She is now mad and taking a fit that she wasn't invited. I don't know why she would even think about being invited when she has no relation to my baby, my husband or myself. Am I wrong for not inviting her? I don't think I am....