It’s just extremely difficult for me to hold a value in my head and perform an operation against another. I do understand the operations though, the concept is fine, the problem is that of numerical values. Numbers. I’m horrible with them. Always had problems remembering important historical dates, my own personal numbers (ids, age, etc). Because it’s such a struggle it becomes very tiring very quickly, and frustrating. That’s what’s hard.









Maybe not in the “smart mind challenging” category but there are plenty of craft kits for your budget: paint canvases by numbers, make your own accessories with clay, bead jewelry, basic engineering kits (build your own robot types), dig your own fossil kits, build-this-or-that-with-LEDlights, gardening kits for kids, etc.
My point is to expand your horizon a bit, it’s perfectly fine that you want to cater to her intelligence and not just go for something girly in a cliche sense. But she can also enjoy crafting stuff.