I remember your thread about the upgrade. I also recall she laid down some rules.
Quote - "She also set some new rules and said they were not flexible. No SVS or HSU sub, they were just too big and she would not allow it. No bookshelf speakers for surround; they would go in the ceiling. No delayed purchases from ID companies, everything would be purchased first thing in the morning; IT IS TIME TO FINISH THIS AND START ENJOYING IT. I had no choice but to say ok."
If you need to slow her down, just remind her of her own hard and fast rules and explain that you also have some limitations to stay within. After all, she can't expect you to live with the double standard where she makes all the rules and you make no rules, can she? Maybe she can.
If you're asking for suggestions, this is all I've got. For some reason, her ground rules stuck in my mind. You can lay out your own rules of engagement, so to speak.