You and your hubby deserve to live in peace. Breaking windows and causing you all of this drama is not peaceful. I would give her an ultimatum. Either she goes for help or she is out. If she is out and ever comes to your home and destroys anything then you will have her arrested for vandelism. Does she have a job......can she pay for the window replacement? I know that is only part of it but she needs to held accountable in some way.
Take care of yourself. I know this is a hard place to be in.
Prayers.............Lo