I'm annoyed and I'm being ungrateful

My mom is throwing me a baby sprinkle. I was really reluctant at first and didnt want to do it but eventually gave in. Since then I've gotten pretty excited about it and I'm looking forward to it. The sprinkle is only two weeks away and we've already sent out invitations and Facebook invites. Today my mom tells me she wants to change the location to somewhere else that's cheaper to rent. Had she said this a few weeks sooner before we told 50 plus people it wouldn't be a problem. But now I'm annoyed that I will have to reach out and message nearly 35 different people and tell them the location has been changed. My mom thinks I'm being unreasonable and that it's not a big deal. I'm just frustrated that she chooses to do this just two weeks beforehand. I would just give her the money to make up the difference in cost if I could but i just left my job for health reasons regarding my babies 😞

I'm being ungrateful but I'm just so annoyed now.

I obviously know I'm coming off as ungrateful right now but I am actually very grateful. Just incredibly frustrating to have to change things around just two weeks before the event when we've been planning for the past 4 months 😂🤦‍♀️🤷🏻‍♀️