That's a really helpful article on gallbladder BIWI, and has made me feel a lot better.
@Eggbound I can only talk from personal experience, having had my gallbladder out at 36, after many many years of suffering, and in particular, triggered by high fat food like butter.
Now at 52, and having lurked and followed this bunch since Dec 2019, I have lost circa 18 - 20lbs, mainly gained from creep year on year, and more recently accelerated by menopause. I am in maintain mode now with around 4lbs tolerance up/down, but at the start, couldn't quite get into proper ketosis so fell naturally into moderate high fat, LC. Possibly because I was also too scared to go all in (and then found out I didn't need to from here!)
I eat all fats including butter. eggs daily, combined with lots of green veg and now able to control the frequency/portion size of 'tastier' carbs, for me which were pasta, rice and bread . Whilst still having the crappy menopause to deal with, I feel so much better and no longer suffer from any of the gall bladder troubles. Your mum should consult with her GP, even though I personally have gone against my own GP's views as I have an arse of one that doesn't get this way of eating. At all.