How do you uninvite tragically awful people?

Hello again, weddit! I need some advice... My wedding is going to be small with a guest count of 50. We love and regularly hang out with everybody who is coming, except for one woman... Our friend (Jake) started dating a woman (Nancy) a year and a half ago. I figured they're serious, so I invited Nancy along with Jake.Well, I've been hearing that Nancy is a nightmare. She is verbally and emotionally abusive to Jake, who allegedly has a history of dating similar people. Nancy will loudly and publicly shame Jake for being too fat (even though he's the most athletic one of us all), and when he lost weight, she complained he wasn't muscley enough. When she comes home from work and he doesn't have dinner ready, she'll shout at him and complain until dinner is served. She is emotionally and verbally aggressive, has never had anything positive to say, and I'm shocked to say nobody on my guest list except Jake likes her.It doesn't stop there. Two mutual friends recently got married. They didn't have much of a budget to work with (like FH and I) but they made the best of it and their wedding was beautiful. I was a bridesmaid, and upon arriving early to help set up on the big day, I saw Nancy sitting in a corner while literally everyone else was helping. I hadn't seen Nancy in over a year so I said hi. She looked at me, gave me a salty stare, and looked away. Our favorite photo from that wedding showed the groom making his grand dance down the aisle. Everyone's eyes were on him, and everyone was smiling. But right smack in the foreground of the photo is Nancy, staring off in another direction with a look of pure dissatisfaction while the groom was coming down the aisle. My friends report that she said the wedding "wasn't a real wedding" because it was low budget, hippie, and unconventional. It hurt me that someone would say such an awful thing about a beautiful day that brought my friends so much joy.Now, I've already sent out my STDs, and Jake's STD was addressed to "Jake & Nancy." But now I do not want her at my wedding. If our guest list was a little larger, I expect I could go the whole day without running into her. But 50 people isn't a lot and I just KNOW the moment I see her salty face, I will berate her for her behavior and tell her how I really feel. I'm not afraid of conflict or being honest. I'm also fiercely loyal to my friends and her gross mistreatment of them is the final straw. It's non-negotiable: that woman is not welcome, and I will not pay for her to have a good time.How do I go about this? Do I talk to Jake, lay out my concerns about her behavior, and tell him I would rather she not be there? Do I send out my invites (going out this week) and leave off Nancy's name from the invite and online RSVP list, and hope Jake gets the hint? What dooo, weddit??!Edit: I'm not worried about being "tacky." I'd rather be tacky than unhappy. :) via /r/weddingplanning http://ift.tt/2sWUEgk