My maid of honor is not really helpful..?

I think you should have two moh. They are both your friends and one wants to help out more,but so what. I dont think you should demote your 10year old friendship. There's even a chance she could take it offensively and start a fight. You'll do good at whatever you choose, they will more than likely understand this is your day so no matter what you do they will be happy for you.