She is very cute! Congrats!
Here is some info. on registering...
ADGA recognizes the following breeds: Alpine, LaMancha, Nigerian Dwarf, Nubian, Oberhasli, Saanen, Sable and Toggenburg.
Purebred - the offspring of a purebred sire and purebred dam of the same breed that conforms to breed standards. LaMancha and Sable are the only breeds that can upgrade from the American herd book to the Purebred herd book.
American - the offspring of a sire and dam of the same breed that conforms to breed standards and also has the correct number of consecutive generations of ancestors who conformed to breed standards (minimum 3 generations for does and 4 for bucks).
Experimental - (1) When two different breeds of Purebred or American goats mate, their offspring are eligible to be recorded as Experimental and
must be shown in the Recorded Grade class. (2) Purebreds or Americans that have serious enough defects to disqualify them from being registered in their breed, must be recorded as Experimentals.
Recorded Grade - Does who do not qualify for either the Purebred or American herd books.
If a doe meets breed standards for a specific breed, she can be recorded as Native on Appearance (NOA) with a written statement of this breed appearance signed by a current ADGA member (not a member of the applicant's family) that the doe being recorded conforms to a specific breed type. A certificate is issued at the same cost on a brown certificate and the goat is called a Recorded Grade. This goat's daughters by a Purebred or American buck of the same breed would be 50% American, and the great granddaughters would be American, provided there has been three consecutive generations of correct breed type (see American section). ADGA does not record grade bucks.
http://adga.org/index.php?option=co...cle&id=101:registration-services-instructions&catid=909:catadgagoats&Itemid=131
http://adga.org/index.php?option=co...ion=com_content&view=article&id=323:artregpar&catid=909:catadgagoats&Itemid=131
However, AGS and ADGA don't accept mini nubians...but there are some smaller registries. I think MDGA is a popular one...but honestly...I don't know anything about registering miniature dairy goats.