Etiquette Conscious Aunt Wearing White @ My Wedding

Normally In this situation, I couldn't find myself caring. However, everyone always talks about " who wore white" to a wedding and will never shut up about it, so here I am.. annoyed that forever this will be brought up.


However, my aunt has always been someone who keeps up with appearances, has been badgering me with formalities about the way I have planned my wedding.
Ex: wanting plated meals instead of food stations, requesting very specific wordings on invites, telling me that digital invites are not real ( even when we're doing paper and digital versions ) etc
( by the way she isnt paying for anything, I don't know where she finds the audacity)
My wedding is in a super insanely gorgeous 1912 botanical garden, we asked guests to not wear white or wear any florals since the venue is already floral enough and very busy when it comes to the greenery and vines that are occurring all over the intimate setting. We said solid colors.

That's some context for you; I was in the phone with her a month ago and she told me she found a dress. She wanted to show me it. The dress is: - Cocktail length - All White - One dainty black flower trail on the bottom portion.

This is 100% inaccurate to what I stated on the site.
However, this is the part that I need advice on.

I told her " it's too white." She straight up said " it's not." I said it is. I'm the bride, and this is the only moment where I've put my foot down.
I then texted her 3 weeks later informing her once more, it's too White.
Well, My aunts sister in law saw the dress and told her ( without talking to me about it first) " it's too white."
My cousin ( her own daughter ) said " mom that's too White. You can't wear that."
My other aunt and her daughter visited last week and told her without me saying anything to them, " that's too white."
My aunt told these people " I'm going to pretend I didn't get Danica's text."
My cousin has offered a mother daughter day out where they both shop for a dress and spend time together, she refused.
My aunt wore white to my brother's wedding and dress rehearsal too.
I don't know what to do, but I'm seconds from texting my planner and informing her to invest in a 4XL bright pink shirt that says " I WORE WHITE" and have her wear that all day.
This aunt is like a mother to me, I'm so hurt that she's formality forward and knows the meanings of all these things and for some reason does this?
I need advice!