It is clear to me that the facts of the case are not available to any of us. We have no idea of the circumstances so it adds little to speculate over what the elders may or may not have seen, the nature and context of the videos or what involvement the secular authorities may have.
I agree with the comments on what on earth is a young girl doing gettting baptised but they are. I would like to think that the elders held off any JC until the girl had been supported and counselled by the relevant authorities however would I bet on it? Not on your life.
It might be possible for a Witness to try provide some mitigation for the elders around "repeated offences" or a manifestation of "godly repentance" but the reality is that the elders should be advised to back off and let the authorities do their work. The reality is however that they feel they have to do something and so wade in with their size 11s...