Why Love Doesn't Stop Fighting

I remember hearing a woman whom I have great respect for tell me a few years back that love doesn't always know when to stop fighting.  She said love by nature keeps fighting as long as there is even a mustard seed of hope remaining. She was telling me this as she was journeying with her son through all of his struggles with the law.  What struck me at the time was that I watched her struggle - she knew her son was making bad decisions, she wasn't defending his actions. But as a mother, love rises to the surface to fight. Her love for her son was what allowed her to fight her inward struggle of not completely walking away from him.  She chose tough love - she had to make those hard choices of watching him leave the home - even turning him into the cops at one point.  But love always fought to remain within her spirit because that's what love does.  
Though I've never had children, I believe this to be true.  From the very voice that breathed man into existence, is the same being in which love came.  The Father's nature of love is one that doesn't stop fighting.
It's hard to let go of what we have loved so deeply and hoped for so strongly.  Intuitively love holds tight and steadfast sometimes even beyond the point of wisdom.  And this I know for a fact, love doesn't always make sense. It isn't always a clear path to walk.  Love is wide and full of dynamics that are sometimes just out of reach for us to understand.  I guess that because love is who the Lord is, there is a mysterious depth to it that transcends so much of what we see and cognitively can comprehend. 
When you love, you really do open yourself to a vulnerability that otherwise no person in their right mind would choose outside of the fact that we were created to love and to be loved.  
I suppose love was never meant to be an easy journey rather a journey taking us deeper into the character of God.