Want someone else to be my maid of honor.

I mean, I'd personally love my girls to wear their dress again and again. It means she feels beautiful in the dress you picked and that's really rare and awesome. There may be a bit of side eye for wearing it first, but as long as it's not torn or stained, I don't see the problem.

You might be able to add a second MOH, but if you demote your friend, prepare for that to be a friendship-ending move.

I think the bigger question is, why do you want someone whom you mistrust/dislike/steals to be your friend at all, let alone a bridesmaid? If she's truly that bad, I would think about it through the lens of a friendship as a whole, regardless of the wedding.

This is your wedding and you are free to do whatever you want. Having said that, you should be aware that this move may end the friendship with this person.

First, you should never be/feel pressured to have anyone as an MOH. It should always be your decision, 100%, and based upon who you are closest with in life. But since you went another direction, you may have to just live with it, unless you aren't concerned with staying friends with this girl. I mean, if what you are saying about her is true, I wouldn't want a "friend" like that anyway, so I wouldn't have a problem asking her to step down as MOH.

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^ All of this!

I would confront the mistrust and stealing as a friend first (not as a bride and MOH).

If you "demote" her from MOH to bridesmaid, I would just assume the friendship would be over. However, I'm not sure why you would want a friend you can't trust and steals from you? The dress aspect, not sure that matters. No one really cares what the wedding party wears, and if they buy the attire I'm pretty sure they can wear it whenever they want.

My MOH was “demoted” to a bridesmaid & my MOH was “promoted” from a bridesmaid to a MOH. My wedding was Saturday & it was perfect. My MOH was the right choice, & even my BM knew this.
Yeah, some ppl may be mad, but my friends all acknowledged that it was me & my now husband day - so they supported us, like adults.

Thank you guys for all your input! It wasn’t her wearing the dress that bothered me it’s the fact she lied about it when I didn’t even ask if that makes sense.