MIL being so weird with her dress for the wedding

I swear wedding planning just brought the crazy out in my MIL.

When we first started planning the wedding I knew I wanted the mothers to wear some sort of rose/pink shade. Our primary color is green but the pink is very minimal so that would be perfect for moms to wear pink so it’s not so green.

Edit: I’d like to clarify I originally didn’t even assign the mothers a color but MIL insisted the mothers wear a specific color so they match and can “stand out” so personally I didn’t even care at the beginning.

Whenever my MIL would show me dresses she liked, they were all baby pink and borderline white. I would tell her if she could just go darker in color that would be great but she can still pick whatever dress she likes. I showered her my mom’s dress which is just an all pink (dusty rose) dress. I told her it didn’t need to be exact but something as deep as what my mom was wearing. My mil then found a dress she really liked which was $1200 and she asked my fiance to pay for it. He declined very quick.

Well my mil bought a dress and she sent me a picture of it. It is a NAVY BLUE dress with some baby pink flowers on it. Blue is not in the color palette at all. At this point I truly don’t care about what happens with the wedding but it just baffles me how my MIL really just went her own direction. The only reason why this is bothering me is because I can’t help but feel like she is intentionally just doing whatever she wants and it’s driving me crazy. Because why make a big deal about what color you’re supposed to wear to not even follow through. I’m not going to make her get a new dress but it is going to be very obvious on the wedding day that she didn’t listen. It’s really just the principle of things now, because again why make it such a big deal to not even do it.