"Science is about guessing, or at least about making judgements using best evidence."
Guessing is only one aspect of the scientific process. Guessing subjects the scientist to scrutiny, and that's why she's getting slammed here. Like many of our contemporaries have stated so eloquently on this thread, she needs to provide details (corroborated theory = fact) in lieu of brushing broad strokes.
Scientists commenting on contentious issues are always going to get slammed...regardless of their preparations, care, supporting evidence, soundness of theory, etc.
she needs to provide details
I'm sure she will in her report. She may already have done so (on NASA site?) but had the details removed by the media. Sensationalism is their bread and butter, you know.