Should we find an attorney or try to settle?

We own a medical services organization that requires a medical director. We just changed medical directors partly due to the doctor taking money from us and not having good business sense, and partly because another surgeon who used to work with him told us some things that worried us tremendously. We ended up actually bringing that surgeon on as our medical director because she was so excited about it and asked for the position. There are a lot more details there but I can only type so much. The surgeons husband (who is also a surgeon) then invested in our business. He now owns 10% of the business. We have confidentiality agreements signed and last night she sent a malicious email and put two other people on it, one being our potential new partner and friend of another investor we have been talking to. She also resigned as medical director as of 10/1(???) in the email. We have reason to believe she is in a manic state and abusing drugs. Our business will now fail because of her action