Since you had several questions, please allow me to answer them in the order presented.
1. what steps does she need to take to enforce this order?
A. Since the existing order is in Arizona and since the father is still in Arizona, no registration of the order is needed. There are several methods for enforcement, but the easiest is oftentimes to simply open a case with Arizona's Department of Economic Security, Division of Child Support Enforcement.
They have lots of enforcement tools--everything from wage garnishment to suspension of his driver's license to criminal prosecution.
2. what motions should she file?
A. If she decided to pursue this on her own, a good place to start is usually with a motion to determine arrears; a motion of this nature will result in a determination of all past due support and penalties; assuming that it is successful, the order resulting from the motion can then be used to enforce the order.
3.does she need an attorney?
A. It is always a good idea when possible, but Child Support Enforcement does most of the things that an attorney will do, just a little bit slower.
4. What percentage of his income should be applied to child support in both states? Arizona and Maine?
A. It depends on a lot of factors, first and foremost the income of the parties and the percentage time spent in each parent's custody, but for two kids close to 100%, it comes to approximately 25% of the parent's net disposable income in both Arizona and Maine.
5. can the order be transfered to maine?
A. With permission of the Arizona court, it can be.
I hope that this helps.