The IP belongs to a Comcast user in Washington, using linux. He uses linux, and is in Washington. I checked the old logs for his site, didn’t see the IP in there, guess he hasn’t accessed his site for some time.
I’d give the lawyer the IP. They could try and get the owner of the IP from Comcast. I don’t know the laws, so I can’t say how easy or hard that would be. If she knows the wifi password, she can go outside his house and search Google for “What is my IP?”. But that might be illegal, and you might not be able to use the evidence obtained that way in court.