thats good advice. the polis will go through her phone and they will check all the numbers, even the pay as you go ones and be able to find out who they are. They will then chap your door or visit you at work. But if you contact them they will arrange for you to visit them discreetly and give a statement. You will be helping them to eliminate yourself. This is a murder enquiry and the polis will leave no stone unturned. There will also be all the dna in her room so if you are known to the polis they will have your dna on file.
I agree with that 100%, although its a bit more than just giving a statement. Over 20 years ago, I went to the police after the murder of a prostitute. They put out warnings that they would be knocking on the doors of car owners that were kerb crawling in Glasgow's red light district, unless they came forward. They did the hard man, soft man, approach, and treated me as a real suspect, so be warned. Soft man befriends you and seems like he's just taking notes, and you meet him first. Then comes hard man and he's a real pain in the arse. After the interview they asked to see inside my car boot. They were surprised to find and then remarked when they found an empty box of cucumbers. I had lifted it from a supermarket in the days when they left out empty boxes for you to take. Make no mistake, they WILL treat you as a suspect, unless they have a positive lead elsewhere. They did find the person responsible in my case. By sheer coincidence, the guy whose dogs found the body worked in the same place as me, and he got the same 'suspect' treatment as me. They dont apologise afterwards either.