Asking My Maid Of Honour To Step Down

Need advice!! I`ve been thinking of asking my maid of honour to step down for several reasons:

1. I didn`t ask my cousin (she is a bridesmaid) to be a maid of honour now a I regret it since I am super close to her, didn`t ask her because she lives in Kelowna now and I was kind of upset that she left but now I`m over it and understand that she just needed a clean slate.

2. My maid of honour Trish doesn`t support my relationship with my fiancee and thinks he is a sleeze ball because of something he said to her 3 years ago that by the way she only told me a week ago and I told her what`s in the past stays in the past if you felt like I needed to know you should have told me back then, me and him are way past those times.

3. After that discussion last week I called her to make up because I was pretty upset, since then I`ve been emailing her about stuff about the wedding and she hasn`t responded to one of my emails.

4. My fiancee friends don`t like her, they all think she treats men like crap and is not a good friend. And my fiancee feels the same way

5. 2 of my bridemaids don`t like her either

6. She never gave her congratulations to jesse or made a big deal about the engagement.

7. She met a guy a month ago and is has already picked out a ring and is moving 2 and the half hours to be with him. Since then I`ve seen her once and it was to try on dresses. Talking about getting married, kind of stealing my thunder if you know what I mean.

Now how do I ask her to step down without getting into a big argument, I know she will probably not even want to talk to me, but i know I will regret it, I want my maid of honour to be someone that supports my relationship, someone who I know I will still talk to in 10 years and someone I can have fun with and not think is a complete nutso when it comes to certain situation.