It seems like a very unusual request for her to make. Like a "if you know of any witnesses to this crime let me know first, so we can... uh... talk to them first". This is the first time I've paid attention to any kind of investigation like this so I don't know what's normal and what's not, but it seems very suspicious for her to want to know about the scope of other people being investigated, like they want to control who's under the microscope and who isn't.