The other issue with this story is we don't actually know the circumstances around the adultery.  One is led to believe this must have been consensual adultery, but what if it wasn't?  What if she never really consented to the marriage in the first place,  since the choice of husband wasn't hers, it was her father's?  Maybe Jesus had His reasons for not condemning her.  He said 'go and sin no more'.  He did not add, 'and return to your husband'.