My mother is breaking my heart.

*sorry, long story kinda*
Me and my now fiancée got engaged on the 20th, as a Christmas gift, my fiancé’s grandfather asked if he could get us eloped. He gave us 3 weeks and I talked him into letting me have it in February. So I’m trying to plan quickly, my mother adores my fiancé, for the past two years my whole family has been waiting for him to ask. And now that we are engaged, my mother is being very rude, shut off, and wants nothing to do with my elopement (which she is invited to) We want a small ceremony with our parents, grandparents, and two closest friends, and then dinner with our families.
I’m trying to plan quickly, since I have such a short amount of time to get so many things done.So I found our venue and tried on a wedding dress over the holiday weekend, the dress was very spur of the moment, since I only had 48 days to plan this whole thing. And my mother was so mad at me for FaceTiming her in the dress that I chose. I offered to not buy it that day so we could go in together to try it and a couple other dresses on so she’d be happy. She said yes, and then no called no showed on me the last 2 days. Our appt was yesterday, I was so embarrassed to call In the morning of and explain that my mother wants nothing to do with it. And then she sends me a text that she doesn’t want to wear a long dress or wear similar colors as everyone else, because it is too “dramatic”. I had suggested a long dress because it will be in February and it we are doing our vows outside so it may be cold and she kept sending me these super dramatic short sexy dresses.About 45 minutes later she sends me a long text about how my elopement isn’t that important and it’s silly to dress up for such a small thing. I just feel beat down. I’ve been planning for almost a week, and I have cried almost every day because of her. She tells me everything I try to show her is tacky, cheesy, or cheap. I’m so disappointed in how she is acting. I’ve always been very close with my mother, but the more serious my relationship gets, the more she tells me how stupid it all is. I don’t even know how to reply to her, I spoke with my grandmother (her mom) yesterday about the whole situation, and I brought up removing my mom from the guest list and she was very sad but understanding. I’m trying to see positive in this, like that it has brought my grandparents so much closer, but my mother has always been my one person to go to, she’s always told me it’s just us. I don’t have a father and my grandparents are out of state. I don’t have close friends because I’m pretty quiet and moved a lot. I just needed the support for the day I get married to my person. All I did was ask about colors and cake toppers, sent pics of the venue, and tried to include her in everything so far. She was my first call when I got engaged and she was excited, and now she acts like it’s annoying or unwanted.
Would I be the worst daughter to have a sit down with her and explain that’s she’s being hurtful, and I’m disappointed in how she has been acting and possibly asking her to not come if it continues to be like this.