Lost a Babysitter

Well we have lost a babysitter. Well, we didn't literally lose her, but we have lost her services. Joselin no longer has any responsibilities over the kids. When she came home she was very helpful around the house and seemed to be trying to be nice with the kids.
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However, she has slowly reverted back to her old ways. She is mean to the kids and does not treat them the way I like. So, she is off of babysitting duty. Along with the loss of responsibilities is the loss of income for her. I pay each girl $100/month for babysitting. I put the money into their bank accounts and they have debit cards to buy their stuff. The idea was to help them learn to budget and keep track of their money. But, no work equals no income.
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Sarah was watching the kids before Joselin came home so she will do fine. Actually Sarah has told me that she would rather be in charge of the kids because she doesn't like the way Joselin treats them. Sarah's biggest problem is that she is too easy. The main person who takes advantage of that is Anthony. He talks terribly to her and outwardly defies her. This is something that we have dealt with for a long time. Anthony can smell a weak person a mile away and takes advantage of them. If anyone has a good way of dealing with this issue, please share it with me! Actually I am considering some type of star chart or something so that they can earn ....uh, something. Like I said, I am still in the contemplating stage. I hope to have something in place for next week.
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I really don't know where we stand with Joselin right now. She does seem to care about school right now and seems to be trying to pass her classes. In April she will take the exit exam and I am curious to see where she stands on that. If she is too far from being able to pass then I wonder if she will lose her motivation for classes.
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As much as she cares for school she seems to not care at all about the family. She is mean to all the kids to include Sarah and even the baby. Most of the time she is fine with me but historically that has been the case. I have had a few incidents where she has been yelling at me and naturally I correct her. I have also caught her in lies so that hasn't changed. I can't forget that she told me that she lies to me so much that she doesn't even know the truth anymore. I have also had some small things taken and when I found the items in her room she claims that she was only borrowing it. We are still missing Sarah's IPod touch and I have my suspicions. Sometimes I feel like she is just a boarder in our home waiting for a better opportunity to come along.
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We have given her more freedoms since she got back since she is 17 and will be 18 years old this summer. It really has not gone well. She has made some very bad decisions for herself. At this point I can only hope that she is learning something from her mistakes.
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Yep, we have lost a babysitter...........but I can't help but feel that we have lost so much more.