Demote moh

Ok first off....I know this topic gets everyone uneasy and let me tell you that I know a MOH is not supposed to be at my beck and call, do all my duties, plan everything, etc. I. Get. That. And honestly I’ve never requested ANY of that out of anyone in my bridal party because they are my closest friends and I just want them to be there and support me on my wedding day as well as during my marriage. I really think having friends in your life to stand by your side through thick and thin during your marriage is important to have. Now, my issue I’m having is that my MOH has not been that supportive person but the rest of my bridesmaids have been. (Yes, my fault for asking her to be my MOH) BUTTTTTT, when I got engaged she immediately was jumping for joy and explaining that she was going to write her MOH speech....yes, before I even proposed to anyone in my bridal party. So, my naive self asked her to be my MOH but ever since then she hasn’t shown much support for me. I created group chats with the entire bridal party, she went ahead and removed herself from it (I honestly don’t understand why), I gave everyone the dates for the weekend of my Bach party - she never responded back to me then told another bridesmaid that she would’ve booked an Airbnb if she “would’ve known that that was my Bach weekend” (but she did know, she just chose not to respond to me). Again, I don’t NEED her duties, but I do NEED her support. And I don’t feel like she’s being very supportive (the list goes on but I don’t need to get that detailed). So, I feel that it is in my best interest to demote her and I know a lot of people will have negative things to say about this and I really don’t need to hear that. I’m not afraid that it will ruin our friendship either (side note: she got engaged after me which I believe is part of the reason why she’s less supportive but she also demoted me as her bridesmaid from MOH and it didn’t hurt my feelings). For those of you who have demoted your MOH, how did you go about telling her?
She told me that she was going to have her sister as her MOH instead because I’m currently in the process of moving across states and switching jobs so I won’t be around to do duties and plan things for her (she does believe a MOH should be at your beck and call FYI 😬)