In an annulment situation, can the "ex-wife" still use the "husband's" last name?

Question Details:

I am filing for annulment from my wife. She lied about her past; she was check into a mental institution. During the time that we were together I had to stop her twice from taking her life. She is out now and she is saying that I can never take back my last name from her. Is this true? Also, she has a daughter not by me, and she is changing her last name to mine. She then tries to threaten me with child support. Can she file for child support if her daughter's last name is changed to mine? Will an annulment change her back to her maiden name and give me back my last name so she can't defraud me?

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