Excuse me, make them look bad? Brides and grooms plan weddings, not mothers, so any "reflections" are on guess who....
Tell her she can give you the fives and say she did in her thank you notes. Tell her the timing is not bad for you. Tell her you aren't asking her to do the work, and you intend to continue to plan your own life.
Ignore her and do what you want. If eloping is attractive, do it. If you want to get married in the state park or the local landfill, do it. When she starts, tell her you think you hear the doorbell ringing, and hang up. You are not required to explain your choices to her, though I am sure you have already tried.
Put your physical and emotional energy where they are needed; her opinions are not part of this.
Sure, there will be stress, but it is up to you to exclude her rants from this, since she evidently will not. (I had such a lovely mother.)
And have a great wedding!