Need advice for a wedding coordinator!!

Hey ladies hopefully you can give me some advice... I'm wanting a very close friend of mine to be my wedding coordinator, not my wedding planner though. Just to help me out on the little things and mainly just be there on the wedding day. She is not an official wedding coordinator but it is a hobby of hers and she did offer to do it. So my question is... How much to I pay her for that? Do I pay her? I wouldn't think it would a huge amount but I don't want to NOT give her enough. Help?! lol Thanks Ladies!