Hi!
Based on our experience, it is never too early to ask and pave the road for future accommodation. Having said that, what kind of vibes are you getting from your DD's teacher? Is she open to suggestions or someone who prefers status quo? Have you noticed any other children in the class who are also good in math, thus the teacher can teach to a group? (Easier to sell the idea to the teacher if there are more than one child that will benefit from the differentiation.)
As for your school's gifted program.... Does it offer math differentiation in 2nd grade (ability grouping for math classes)? Or, is it a pull-out once a week for an hour program? It might be worthwhile to "bump" into the GT teacher when you are volunteering and find out more about the program.
Have a dedicated notebook and start jogging down notes. Hopefully your journey will be a smooth sail.
Good luck,
Mag
