Why does shakespeare construct juliet`s lines so that she never directly lies?

I've read Romeo and Juliet many times, and I can't agree with your question as to "Why does Shakespeare construct Juliet's lines so that she never directly lies" There are several times where she led others to believe something other than the truth-- she led her father to believe she was going to the confessional for her rebellion, when she was truly going to marry Romeo.  She also finally acts as though she has succumbed to her father and will marry Paris. 
That being said: I said "led on to believe" which is our day and age is considered lying/dishonesty.  However when Shakespeare wrote this in 1597, things were much different than the are today.  Why does Shakespeare construct Juliet`s lines so that she never directly lies? A potienal answer could be: Shakespeare wanted the character of Juliet to remain innocently caught up in between the fued of the Montague and Capulet.  If she had out right lied, her fragile, innocent perseption could be seen more as deception and connivery.