Woman samurai have actuallly existed. Tomoe Gozen for example. But Asami Ishikawa, is a fictional such samurai.
I got a bit inspired by O-Ren Ishii from the Kill Bill movies. But Asami Ishikawa is on the good side instead.
But feel free to use the console command : showracemenu, if you want her to be O-Ren Ishii instead?

You will need the following mods:

1. Budoka ~ Asian Race by Modzillaz

http://www.nexusmods.com/oblivion/mods/8836/?

2.Akaviri Japanese Clothing by Corthian

http://www.nexusmods.com/oblivion/mods/8499/?

3. Shirasaya Samurai Sword by wintermuteai1

http://www.nexusmods.com/oblivion/mods/32020/?

4.Apachii Wigs for Males and Females by Apachii

http://www.nexusmods.com/oblivion/mods/40774/?

5.If you want Japanese bows? Japanese Bows by Jos3006

http://www.nexusmods.com/oblivion/mods/30046/?

Thanks to the modders above.

No shortage of money, a couple of good weapons and other stuff are included.

She is at the entrance at Weynon Priority.

Have a great time with Asami now!