Lydia Feminine

You need only The Elder Scrolls V Skyrim.

She is standing, running and walking as a woman with this files.
Her weight was 100 before. 0 now.
Her height was 1,0. Now 0,95.
She was aggressive before, now unaggressive with this file.
Her energy was 50, now 100.
Her speed was 100, now 200.
She is no more protected. She can die.

But doesn't work with old saves. You need a new game.
May be you try Fast Start with Save Games Dovahkiin
http://www.nexusmods.com/skyrim/mods/67985/?
You can start after escape from Helgen Keep with these save games.