Hello I am a licensed attorney here to help you with your question, please review my response and do not hesitate to ask for clarification
This is a common situation, the first course of action for you is to have all employee sign a non solicitation and Non disclosure agreement, so they do not provide the former employee any information,
You can then send Cease and Desist letter to the former employee for her solicitation of confidential trade secrets,
if she fails to stop, you can retain an attorney to file a Court injunction stopping her from working, by claiming she obtained confidential trade secrets from your company,
It would be best to have employees sign a non solicit when they leave, or when they join your company so these types of issues do not happen.
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