Taylor's girlfriend did. Taylor had moved in with her maybe 5 weeks before. She has been the driving force in this investigation; she was the hub of all the information from Taylor's associates.
It's worth noting that after a week of disappearance, her anger towards what she'd learned about Taylor's turned into sympathy and concern. She did a 180 on critical issues. Her position today is that "Taylor is mentally stable" and "Taylor is not a danger to her son." This was not the case in the days following her disappearance: she was fearful for her physical safety from Taylor due to the depth of the lies that she suddenly uncovered. I don't quite know what to make of it, so I'll default to my training here. Using
the 'admiralty code' that we use for HUMINT assessment, I'd assign her initial reports as F2, and her new reports as E5.