It seems it's just a message from Tomcat V.7.0.29, there is a 7.0.39 but that's very recent.
I've replied and asked under what circumstances - it sounds the sort of message that would come back from a web site. From the little I currently know I'd be very surprised if the sister is running a web server on her PC - at least not knowingly.
I've also suggested Ccleaner, MalwareBytes & SuperAntiSpyware to check in case of a nasty.
We have more and more laws, and less and less enforcement