You can contact the Arizona Department of Child Safety and state that the name of the child, your relationship to the child, and that you would like to be involved. If you would be interested in being a placement option, make certain you state that as well. The number is (602) 255-2500. Please note they may not be allowed to give you information due to confidentiality rules and laws.
You may also wish to retain an attorney to advocate with the Department of Child Safety and, if necessary, file to be heard in the actual court case.