The description in "Heike Monogatari" and "Genpei Seisuiki" that she was a military commander is doubtful as a historical fact and it is highly possible that it is literary fiction.
女武将であるという『平家物語』や『源平盛衰記』の記述は史実としては疑問があり、文学的脚色である可能性も高い。