undue* -_-;;

The ぬきに／ぬきで (抜き） means without. The whole sentence is basically saying "All flattery aside, she is a wonderful person." ( She truly is wonderful. I am not just giving her undo compliments.) お世辞ぬきで＝without flattery (= all flattery aside) 冗談ぬきに＝without kidding (= in all seriousness) Hope this helps, maybe someone else can give you more info. ^^