[Serious] How to track down someone who has been sending anonymous threatening texts to my friend and knows her location at all times?

My friend is being bullied by receiving threatening text messages such as "watch out for what's next" and this person is reaching out to a lot of her friends and family with details of her private conversations. This person connects with her friends and family from random numbers that seem to be created through number generators like websites and apps. This person also knows her location as he/she also texts people saying that my friend is in trouble and needs someone to pick her up following with the address of the location she is at. At this point, i'm extremely worried about her well-being and safety, my safety, as well as the safety of her friends and family. This person has also managed to hack into her social media accounts and get details of her conversations. I'm reaching out here because she has tried talking to the cops but they were not helpful. Is there a way to track these numbers down and get their IP address? If not, what should I do in a situation like this? Every step she takes as well as every conversation she has is monitored by someone who is trying to hurt her. If I had a friend in IT would that help at all? Anyone I involve will have to know private details of her life and that's why I would only want to involve whoever is necessary. Any advice on what to do would be appreciated.

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