When her main bread winner is fired, a maverick celebrity agent must battle her industry rivals and reinvent herself to save her business from impending financial ruin.

Well done - agree!

I don't think the plot should be to re-invent herself. It should be to re-invent the client who was fired. After all, now that her client is fired it will be up to her to get him a new job.

Reinvent herself for me is vague. It doesn't have a start or a finish. If I look for clues in your logline I can see maverick. So does the reinvention make her conservative? Overcome a fear of heights to become a skydiver is an example.

"After years of burning bridges an agent loses her only big client, she must reinvent herself and win back people she wrong to save her business". Off the top of my head. I was trying add a goal and specific action.