Hi
@Rurbo,
Welcome to the forum.
It's absolutely wonderful that you're helping your mother to get through this. As you probably realize readings between 9 and 11 are loads better than readings in the 20+ range. So, really well done.
Truly normal readings would probably be in the range of 4 to 8. Based on experience, it may take a couple of weeks/months for readings to get into the normal range on a low carb diet.
How long's your mother been on low carb? What's a typical day of eating like? What type of foods does your mother miss most? Maybe we can help with suggestions?