First, it's hard for the MOG's because traditionally they do have very little involvement.
You need to tell her as the mother of the bride AND the hostess (since you are paying for it) it's your show....and THAT is tradition when it comes to weddings, therefore the wedding planning 'spotlight' does belong to you, however......
she should be invited to go when her son & his guys are fitted for their tuxes WITH the understanding the choice in tux is not hers. If she can avoid causing problems with the choices made, the MOG can pay for the flowers and the booze at the reception...AND the wedding rehearsal dinner is her baby entirely.....tell her that is where the MOB 'shines'-throwing a great rehearsal dinner the day or two before the wedding.
..and PLEASE, to avoid trouble, include the groom's parents in the wedding invite as ' John Doe, son of Mr & Mrs. Frank Doe '....it's a simple courtesy that will prevent a lot of trouble and yet it in no way implies they are hosting the wedding....good luck and have patience, and tell MOG that YOU, not your daughter, is in charge since it's tradition & your money so all 'problems' are to be addressed to YOU...and hang tough, Hon.
...if it gets too out of hand threaten to give the couple the wedding money and insist they elope...that will do MOG out of any kind of wedding and it may 'rein her in'. My Mom did that with my first marriage and all the nonsense (gossip) at my MIL's end stopped.