Do you think she is being childish

I was talking to a friend of mine a few days ago about my e-party. She asked me if I am talking to a girl christina. I said yes I am, I just spoke to her last night. My friend asked me if I invited her to the party. I said yes she got her invite but she hasnt responded. My friend said 'oh boy then you better have a talk with her because she just sent out an email inviting a whole list of friends including some you invited to your party for a BBQ at her place the same exact day and time as your e-party. I didnt see your name on the list and I figured you and her had a falling out'

I told my friend she is doing this on purpose. My friend asked what I meant. I said she is mad that I didnt ask her to be a BM, I asked another sorority sister to be a BM, and I wouldnt let her plan my wedding. She is mad and this is her way of getting back at me.

My friend said that is really wrong and extremely childish. I agreed.

What do you ladies think??

I am too a point I am just going to wash my hands of this girl. If she wants to plan her little BBQ same day and time as my party then she can have it, I have friends and family who are excited for me regardless.