As a low carbing T2, I found for the occasional false hypos I had early on, and for what it's worth many years previously, and well before diabetic diagnosis, for the few genuine and rather scary migraine induced hypos I had then (as I wasn't aware then of such things) the only thing my body craved - and in the case of the more serious migraine ones actually insisted on - was immediate access to sugar.
Regarding the Libre sensor levels, mine always and consistently read 1-1.5 lower than my finger pricks, and I also had to let them sit and acclimatise for about 48 hours rather than the usual 12, or they'd claim during some of that initial period - particularly overnight if I lay on that arm - that I was more or less dead
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