Although it is grammatically correct for a woman to say “modah ani” (rather than “modeh ani”), and to say “shelo assani goyah” and “shelo assani shifchah” (rather than “goy” and “aved”), nevertheless, the common custom is for a woman to say the standard nussach.
Shabbos Bulletin Parshas Shelach Lecha 5779
About the Author: Lev Seltzer
Lev Seltzer has been a member of Beis Tefillah from just a short time after its founding. He currently manages the BTYA.org website, and can be found every morning in the BTYA "Vasikin Room" where he is the gabbai of the minyon.