fmil Planned Rehearsal Dinner at a more expensive wedding Venue then actual wedding

Hi everyone, some background. Our wedding is on May 24th 2020. My FH and I are paying for probably about 10,000 worth of our wedding ourselves, and my parents are paying for the rest. His parents have not asked to help out at all with the wedding financially, but have been adamant about doing the rehearsal dinner for us. Up until last week, as far as I knew we had already booked the rehearsal at a restaurant about 15 minutes from the venue and 5 from the hotel that my FH and I absolutely love. It was just what we had asked for, a casual and intimate space to relax with our closest family and friends before the wedding. I get a call last week from my FMIL that this place hasn't been answering her emails and calls in a timely manner (our wedding is over 4 months away why is she bugging them so much?) and that she does not want to do business with them. I am obviously disappointed, I loved this place, but fine if she wants to find another restaurant there is plenty in the area! Fast forward to yesterday, I get a text that they have booked an extremely expensive and nice wedding venue for the rehearsal dinner, without even asking me or my FH. This place is 30 minutes from our venue and 40 minutes from the hotel we booked. This is exactly what we didn't want. This is a ballroom and deck that is made to fit over 300 people, and we have 30 people going to the rehearsal. That is going to look ridiculous, and it not the intimate setting we wanted. I look at all the pictures, videos, and menu and realize this place is way fancier and nicer then my actual wedding venue. She is doing top tier food, and open bar the whole time. We don't have that at our actual wedding. I am super stressed out now that this rehearsal dinner is going to upstage my actual wedding and I feel like I have to compete with it. I have been putting in a ton of work for our wedding and I am just super confused why my FMIL wants to overshadow our wedding with this unnecessary second wedding, why cant we just have a low key rehearsal dinner. I don't think she has bad intentions, just wants to throw a great party, but I honestly feel like this is a waste of her money and is more for her than for me and my FH. Am I crazy or do most people have their rehearsal dinners in small rooms in restaurants? My FH is not happy but doesn't want to hurt his moms feelings, she is very excited. Am I in the right to say something? I don't want my wedding day to feel second best to this rehearsal dinner and that's how its feeling.