You should contact the principal. My recommendation would be to ask that the math instructional specialist and the reading instructional specialist evaluate your child in the spring of this year for proper placement the following year. I ended up going this route for DC3 when they came out of K in Montessori. DC3 age would be 1st grade. Academically DC3 was ready for 2nd grade reading and 3rd grade math. Scheduling option was either reading 1st and float to 3rd for math, or placement in 2nd grade for both (which is what we did). Some of this is because the principal already knew our family. DC1 was very advanced, but we didn't know to apply for HGC (at the time) and so principal was challenged with DC1 grouping in 4th & 5th (DC1 ended up in MS and HS magnets). DC2 was floated a grade level up in math and went to HGC (and on to MS and HS magnets). So skipping DC3 an entire grade wasn't unexpected. DC3 also ended up at HGC (and followed magnet route through HS).
The key is to ask for an evaluation and then work with the principal for an appropriate placement. Don't presume a specific solution is the right solution. However, if your daughter is currently grade 2, the better solution may be to enroll her in grade 3 next year and hope for placement in the CES program for 4th and 5th. Or you could possibly see about transferring into 3rd grade this year in December to get MAP-R and MAP-M testing data in time for screening for next year's 4th grade CES cohort.
https://www.montgomeryschoolsmd.org/curriculum/specialprograms/elementary/highly-gifted-centers.aspx