“Paskening the Halacha whether it is a Mitzva or not IS within our bounds of Lo Bashomayim He.”
So, why dont we see what the shulchan aruch has to say about this. Why not start in siman reish mem vav (yoreh deah)sif vav. Continue with the rma and the nosei keilim.
The mechaber does say that even tough she has no mitzvah of talmud torah, she does earn schar for learning. Since hashem is the one who awards the schar, I think it is best left up to him to determine the value of the learning and the schar given.