My name is ***** ***** I am a NSW Solicitor. Thank you for your question, and will do my best to assist you with your question. Please understand this is not legal advise but a guide to assist you.
If you have concerns for your husband injuring his step daughter (your daughter) you have to report this to the authorities, from your description he appears to be unstable and may be suffering psychologically. If he is not having treatment he should.
Your daughters father may use this against you to seek to have orders changed and she live with him.
You have to speak to a family law solicitor to get this sorted assay as the childs father can argue because you are not available to look after her she should live with him.
I hope this makes sense and is of assistance . If there is nothing further
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