Some of my friends in our Bais Yaakov type of school for Frum girls, also count like me Sefirat Haomer every night. I know that some avoid counting Sefira least they forget. What is the correct Minhag and what is Horav Miller’s Shlit’a opinion?
A. In principle women are broadly exempt from counting Sefirat HaOmer since it is a positive time-bound Mitzva or namely, a mitzvah Aseh She'hazman Grama. ( Rambam Hil. Temidim 7:24). The above is also the opinion of many Rishonim and Acharonim.
However some Poskim allow women to count with a Bracha. Most Sephardic and some Ashkenazic opinions advise against women counting, or recommend doing so without a blessing.