Mod will add to you "Mini companion"
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It already has Nightingale Bow and Elven Arrows.

She owns different spells, even can call some creature.

If you want give she other weapon's install this mod "NPC Bartering".

http://www.skyrimnexus.com/downloads/file.php?id=6802

Companion will follow, and to fight for you, but to direct orders doesn't listen...

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Installation

Drop file "Mini.esp" in Skyrim\Data\...

Activate in laucher file "Mini"

Come into game, quickly move to other location then you will have it =)

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Thanks to "NPC Editor" and tutorial =)

http://www.skyrimnexus.com/downloads/file.php?id=4590