so much anger

I have so much anger in me right now. Bio mom moved 200 miles away without consent and didn't notify us. Now she expects us to drive 200 miles to pick the kids back up after her visit. Financially we cannot afford that we dont even get child support and our vehicle can't drive 400 miles every 2 weeks! And of course the court just says her violation is a process and we have to follow the court order as it is written. If she doesn't why do we!!! I'm so done I seriously just want to leave. This is not my fight but I have the kids the most of the time becuase of Gary's work.  I am their parent, have been for the last 2 years. They call me mom. They come to me when they are sad. It makes me not want to be in this situation at all. I don't want this life anymore. It's too much drama. It may seem selfish to people but why is it all on me just because my husband doesn't have a backbone of his own to fight. He says he's not sending them because we can't go pick them up. So he's gonna get in trouble and she gets make up time. We put in to have it changed so she's responsible for transportation since she moved, but the hearing isn't for weeks and there's no guarntee they will do that. I'm so angry I could scream right here at work!!!! I  hate that she does this and that she bothers me so much.