Diva Bridesmaid

So, I’m also hyper aware of if I’m acting like a bridezilla or not. That is the last thing I want to do, because I am aware that the world doesn’t revolve around me just because I’m getting married. That being said, we are having a very small wedding, which no participants who bring drama!! For the bridal party, my fiancé asked his three best friends; for me, I asked my sister to be MOH, My two cousins who are like siblings to me to be a bridesmaid and bridesman, and the best man’s girlfriend to be a bridesmaid as well. The girlfriend and I get along very well, and they have been dating almost as long as me and my fiancé. We don’t really hang out without them, but she does have a tendency to be a little bossy, which irks the other friends. I’ve never been bothered with this until now.
A few weeks ago we went bridesmaid dress shopping. The girls were all there for my wedding dress shopping and everything went super well. We went to David’s bridal, and I want to do mismatched dresses. I picked the three colors and the length and told them to go ahead picking what they wanted and I would have veto power. My girls have three different body types, so my top priority is them feeling comfortable. Diva bridesmaid was a little rude to the consultant and she picked the Vera wang dresses even though she stated she was concerned about money (even though she works seven days a week apparently and pays no rent). So while I’m having the girls try on specific looks together, diva is off with the consultant looking at shoes. When she finally gets over, she is very pushy about the styles everyone is wearing. My sister put on one halter dress that we both hated ( she is uncomfortable with her shoulders) and diva said that one was perfect even though I was like nope. Finally, the girls all settled on their styles, when diva takes this moment to come over to me and say: these dresses are crap material, but I can take a pic of it and send it to my mom in Ecuador so she can make the dress for me.
What? Normally I have no filter but I didn’t want to be rude, so I just said we don’t have to purchase anything today. But she is saying they are so expensive (they’re not, honestly) and she picked it out herself!! Then as I’m trying to buy color swatches and get the tags off the dresses so I can find them easily, she’s arguing with me about my colors and fabrics and also purchasing the same color swatches as me. For what purpose I don’t know, since I haven’t asked anyone to help me out with vendors and coordinating yet. Then in the drive home she decided to berate me about my job and how I need to go back to school to be a teacher, which is not something I ever wanted to do, and I have no desire to go back to school. I am happy with my job, I make decent money, and I am working hard on finishing a novel to publish, but apparently I’m better than all that. Now I want to move forward with the dresses, but I don’t think she will buy it. I was planning on offering to go back with her and find a dress in the color that is cheaper and matches the styles of the other two, but I’m afraid she will push for her mom to make it. If she wasn’t in the bridal party I wouldn’t care, but these dresses are my entire color scheme and they need to match. I don’t want to hurt her feelings or make the Best Man upset, but I feel like if she can’t afford her dress than she shouldn’t be in the bridal party. I am planning on paying for hair and makeup and jewelry for all of them, so all she needs to do is purchase her dress and shoes. I don’t know what to do.