There's a certain amount that you can do to improve the situation:
Help your boss to delegate to you more effectively by prompting her to give you all the information you will need up front, and to set interim review points along the way.
Volunteer to take on work or projects that you're confident you'll be good at. This will start to increase his confidence in you - and his delegation skills.
Make sure that you communicate progress to your boss regularly, to discourage her from seeking information just because she hasn't had any for a while.
Concentrate on helping your boss to change one micromanagement habit at a time. Remember that she's only human too, and is allowed to make mistakes!