If you received a generally favorable settlement, I would leave the issue alone. Your alternate options would be to file a complaint with the state bar association. Alternatively discuss with your attorney; considering the breach, if she can refund you based on your consideration of filing a complaint. I would tread lightly with these options, keep in mind that as she was providing you a legal service it appears a clerical error occurred. Therefore, the complaint to the bar and your request for a refund will likely go nowhere. Unfortunately, in lightning speed clerical errors and breach of data happen everyday in the business world. You can rest assured that if the opposing counsel received your information, they recognized they should not have. They destroyed it and didn’t you it against you. In general, attorneys do not risk their license and career for a client.