Boy do I need Grace...so pray for that please!

So I am not writing this to be hateful....I write mostly to vent or share or ask for prayers.  And today I am asking for both Grace and prayers, guess that means I need you to pray for Grace.  When I married my husband I knew he had EX's and I knew he had children.  I came into the relationship with EX's and no children.  But boy I wish I knew then what I know now.  See I thought I could change the world.  I thought that I could smooth the relationship between the ex wife and have this fantastic relationship with the children whom I love dearly, but today the relationship is not what I had envisioned at the beginning.  This ex is not like anyone I had ever encountered.  I will ask for prayers for her as well!  We had to get some child support papers modified today because one of the children turned 18.  This child of hers my husband adopted when they married.  As they signed the modification papers she says to him that they would like to terminate the adoption and have been wanting to for years.  You see this is the deal...she has been wanting to for years and she chose not to because that would mean she could no longer receive support for that child.  So for the last three years she has collected from us and we have STRUGGLED to pay.......why?  She didnt want Dan to be her father for three years....what! You see where I am going here.  She has been laughing right to the bank this whole time!  This is just one story of many many.  Many tears, many sleepless nights and many many dollars!  I am angry to say the least at her audacity, but not surprised.  This is just however another twist to the knife that has been in our spine for a long time.  So this is where I am, please pray for me cause I need to find the grace I know I have, and at this very minute it's no where in sight.  And I am also asking you to pray for her and that she finds peace in her life.  Also for anyone that is judging me right now for writing this please forgive me...it's been a long hard road.