NM law allows for courts to appoint Guardian ad Litems in custody cases. The types of cases that usually get a GaL appointed are those that have unique issues or are highly contentious. The whole GaL system is governed by statute, however, courts usually give a great deal of leeway and latitude to a GaL.
A GaL is an attorney appointed to represent a child(ren). The statute has several jobs a GaL is supposed to perform. There is usually, however, a large divide between what the statute requires and the reality of practice. You must be prepared when dealing with a GaL. There are specific things that you can do to help yourself when dealing with a GaL.
Here are some broad ideas to help you.
1. Plan for your interaction with the GaL.
2. Have a plan of what you want accomplished.
3. Be aware of the negatives of what will be said about you and be prepared to address those with the GaL.