The short answer is, based on all the information you've provided, it seems unlikely anything will come of this.
Now, for some more detail. Generally speaking, if there is going to be a criminal investigation and prosecution, it will begin immediately. The reasons are probably obvious; the evidence is at it's freshest right away and it benefits the parties involved to move things forward quickly. You are likely correct in your implying that there may have been CCTV, most clubs have surveillance these days. So, had anything happened, it would have been recorded. You mentioned she detailed injuries, if this were true, and due to actions by you, you likely would have been questioned already.
It would also seem to work in your favor that this woman has a history with your family. If she has had arguments with your mother, and now with you, the implication is that she simply doesn't care for you or your family. That would certainly be taken into consideration in any criminal investigation.
With all these things in mind, it seems improbable that anything will come of this incident.
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Regarding the nightclub incident, yes, you should absolutely mention ALL the derogatory history coming from this lady, it clearly paints a negative picture of her and helps you. This would include any arguments, vandalism, harassment, violence or threats of violence.
The internet issue is much more difficult to predict. The law hasn't caught up with the internet, the legal system simply hasn't figured out how to handle all the things that are possible on the internet. However, if she is saying something that 1) is a lie and 2) is causing you some quantifiable harm, you MAY be able to take action against her and have the items removed. If the items are true or are clearly her opinion, there probably isn't anything you can do.
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