Hi Sarah,
I think the best thing you can do is firstly, make an official report to the police for harassment and keep in touch with them if anything else happens.
It may also be wise for your daughter to reset all her passwords and to check to make sure she is not giving away personal information online. Womens protection groups are also a good option, they have a lot of resources that could help you from a legal and practical point of view. You can also contact the cybersmile help team at [email protected] for more advice or info. I hope everything works out for you and your daughter. We are always here for you.

Getting in touch with child services or women's protection/victim support organisations is a good idea. Your daughter is the victim of targeted and organised harassment and intimidation and that is what these groups are there for. They will also know what agencies could and should do to help.