The reality it that we can manage perfectly well without any carbs at all (they are not necessary for nutrition, and there is no minimum carb amount necessary for health).
So no, you cannot go 'too low'.
However, different people can tolerate different amounts of carbs.
We see it here on the forum all the time.
People often find out a level of carb intake that suits them, and then decide to recommend that amount of carbs to other people. The drawback is that we each have a body that doesn't toe the line to other people's expectations.
So it is important that we work out what works best for us, and then stick to it.
The T2 you were talking to may flourish on her chosen amount of carbs. That is wonderful. Doesn't mean that it would work for you.
Another possibility is that she has heard, and believes, the myth that 'we all need 130g carbs a day, because the brain needs 130g glucose a day, or our brain dribbles out of our ears, and we all turn into zombies'.
OK, I may have exaggerated that last bit, a little.
But if there were any truth in that myth, I would have been one of the walking undead for around 8 years, and here I am, still alive and kicking.
If you do a tour of the internet you will find all sorts of people spouting this myth, including some highly qualified medical professionals and dieticians.
The reality is that yes, the brain needs some glucose to function.
But we don't need to get that glucose from carbs and sugars in foods.
We can function perfectly well, indefinitely, breaking down keto foods and building glucose on demand.
The process is called gluconeogenesis, and we can all do it, without being aware of it. No need to eat 130g carbs a day.
https://lowcarbrn.wordpress.com/dia...we-really-need-130g-of-carbohydrates-per-day/