what is the best title to honor and give my hostess on the wedding programs?

Her duties will be to help with set up and tear down,pass out the programs,greet people at the reception,watch over the gift table,help with the wishing tree,answer the vendors questions during the reception and to make sure everything runs smoothly..wow as I am writing this i realize she will have a lot of tasks..is this too much?I just need a name to honor her..would mistress of ceremonies work?..she is married so not sure mistress is the right word..any help would be appreciated.