I'm going get rid of my moh's plus one for my wedding
That feels very unusual. Why would you get rid of her plus one?
Because my fiance needs someone else to be there more than my MOH's plus one. I have plenty of people whom I can practice my vows with.
You shouldn't do that behind your MOH's back. You should talk to her before deciding and see if it is okay with her not having a plus one.
It's more fun this way. Now she knows how it feels to be the secondary.
I feel like whatever your maid of honor has done to you is not a justification that you will not be allowing her plus one. She may get upset and may not really enjoy her time in your wedding and that can ruin your friendship. I would recommend you talk with her sincerely about your problems instead of doing something that can be considered a petty revenge.