what does non-involment mean on a court document I received in the mail

Most likely they are saying you lack a history of being involved, but Grandparent visitation rights and a guardianship are different things.  You should consult with an attorney, trying to obtain a "Temporary Guardianship" without an attorney would be a huge mistake.  If it is your desire that the parents "get help" working out an agreed Guardianship with the step-by-step requirements for it ending should not be that difficult.  Visitation can and should be established and you will save a lot of time and prevent ill-will if you work together to reach agreements that can then be provided to the assigned Judge as a proposed Order.