@mathmom I knew about MIT and Cambridge (Oxford as well), but that UCB + UVA is a surprise. She may have done something really amazing for them to ignore her public university background…
Of course, most departments in most Ivies deny tenure to their assistant professors (the tenured positions are kept for poaching people who have become famous elsewhere). However, since this is well known across academia, it is not a stigma, and faculty who are denied tenure at Ivies are snapped up almost immediately, usually with tenure or a very shortened tenure track.