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I am sorry to learn of this situation. My very best advice to you in this situation is to retain a lawyer to represent you in this matter (I know that customers do not come to this forum to be told "go hire a lawyer" but in this type of case that really is your best course of action - both to help you best leverage your legal position and to help deal with this family dynamic).
The causes of action that you have against your daughter for stealing your business include "conversion" (the civil equivalent of theft), breach of fiduciary duty, fraud, breach of contract, and likely other causes of action. This is intentional conduct so not only is she responsible for your actual damages, but you can also attempt to recover punitive or "exemplary" damages.
You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).
I would hire that attorney.
You don't have a contract, you made her an offer, she never accepted.
You are welcome, and I do wish you the best with this matter.
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Thank you again, and again I wish you the best.