Leadership is Not About Micromanagement

Start doing weekly self-check-ins. Try and figure out what's driving you to control the small things.
Meet with your team(s) for conversation rather than reviewing to-do lists and reminding them what wasn't done. Get to know them.
Re-read your museum's vision and values.
Listen before judging. If you're a staff member who works for a micromanager...
Start doing weekly self-check-ins. Have you let deadlines slip? Are you the only person getting the micromanaging treatment or is it global?
Step up and stay ahead of her needs. By anticipating her anxieties you may build trust and start to alleviate her nit picking.
Don't take it personally, particularly if her behavior is the same everywhere. This is not the moment to be Joan of Arc on your white horse. Lead from behind instead and keep it about the work. The best leaders empower their staff. They give them the tools to get where they need to go, have their backs if they hop a guard rail, and support them when they cross the finish line. Joan Baldwin