Uhhh....are you sure you want to make an entrance into a room full of adventurers disguised as an enemy?  Not to mention the implication you've already gone out and killed something based on the skill's limitation in the character sheet...how would she have even gotten that far into the keep disguised like that, wouldn't the guards at the main entrance and between there and the common room stopped her if she had already gone out and killed a skeleton to disguise herself as one?  o.O