I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
The fact that the CPS case is going to be closed plays no part in whether you must continue going to AA. If you were ordered to go to AA as part of the process of being reunited with your child(ren), and they order that you attend for a specific period of time, then yes, you are still obligated to attend AA, even though the case may be formally closed. This is no different from a court ordering you to pay restitution and your probation coming to an end. If the restitution is not paid by the time probation is over, it is nevertheless still owed.
If there was no minimum time that you were told that you have to attend AA, then if they close the case as having been completed, you may then terminate attending AA.
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I wish you and yours the best in 2016,