My eldest DD(13) was never particularly mathy, but now at high school consistently tops the gifted class in maths (and art... weird combination!) At a younger age her writing was what really set her apart. Her youngest sibling -DD(7)- on the other hand, is way way way more 'mathy' now than her big sister ever was: she absolutely loves all things math, and is double-accelerated in that subject and still topping the year group.
When she was a baby she was obsessed with drawing- could draw purposeful pictures by 12 months and started writing her name not long after that (by 21 months was labeling her own drawings with her name- and it's not a short name, either!)Her IQ testing (WISC) revealed that her verbal was by far the strongest area (off-the-charts high)which wasn't such a surprise given she taught herself to read very young and speaks like a mini adult smile