Your story is more or less fascinating because at any point in time we try to introduce bitcoin to people around us irrespective of their gender differences, i will say that your sister had made her choice already right from when she demanded to learn about bitcoin, she realized that her gender difference shouldn't be a barrier to knowing about bitcoin, be an investor and be financially free and independent, same should other people learn from this that bitcoin is meant for all, no gender bias, it's not meant for the men alone, try encourage her to take more adequate steps in learning about bitcoin the more because she's just getting started.
I also have taught my siblings to engage with bitcoin. My Fisrt sibling is boy then my second sibling is girl, although my first sibling give more attention then her, i should not different their gender as barriers. Maybe they have different preferences so i can not ask them for the same response and attention.