thats because invisibility (holy crap thats alot of i's in one word) goes away the second you try to act out anything such as stealing or attacking.
you'd be better to use chameleon (which doesnt go away on actions) spells/potions/items to make yourself 100% chameleon, then sneak up to her and hit her with your biggest enchanted weapon to do critical damage and kill her without being seen.
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mages may seem cool, but if there was a multi player game you wouldnt see my theif/assasin until you were already too dead to cast a spell...
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