Well then again theoretical physics was dominated by "string theory" for decades despite a lack of any physical or experimental evidence, so we should take consensus about speculative physics with a grain of salt. This sort of speculation is precisely what physicists should be doing, within measure. At least Sabine appears to recognize her "out there" aspect, unlike say the string theorists that stifled physics for decades. At worse maybe she'll annoy another theoretician to analytically disprove her.

That said of course whatever quantum gravity would bring it'll need to reduce to match known physics. However at the fringes of known physics what will happen as you get nearer to the singularities in special relativity? Generally speaking in the past singularities in physics have been due to incomplete knowledge of the physics in these regions.