Police officer here and can prove it if anyone doubts it.
They cannot trace you, they do not have your
IP address (this lie that influencers spread explained here) .
She would need to have a warrant issued to tattle to release the IP addresses to the police- they wouldnāt hand them over to her.
The owner of tattle could get their own legal advice before handing over any information.
Essentially it could be dragged out for months.
Irrelevant though because it quite simple isnāt true, there is no crime and the police will not help them with anything thatās been said on tattle.
If she is receiving direct messages thatās a different matter but the process would still be the same.
The police would get a warrant that would force Instagram to hand over the IP address, the police would investigate but the identity/ip address/phone number would not just be handed over to the meldrums. There is due process and innocent to proven guilty etc