Your lawyer may be able to attend the mediation with you. If so then she will be able to provide you with support and counsel throughout the process.
Some people are uncomfortable speaking in public and may ask their lawyers to do all the talking in the mediation. I would ask you to reconsider. There is a real benefit to using your own words for your own benefit and for the increased understanding of the other side.
Rather than use your lawyer as an advocate, use her as your trusted advisor. When the other side presents information or options you can use your lawyer’s experience and knowledge to help you assess new ideas. Make the most of having access to a lawyer.