You could obtain Pinto papers very easily. All you have to do is pay the undocumented, meaning unknown parents, price of $125 plus a $40 membership, so $165 total for papers is pretty cheap. I wouldn't specifically tell them anywhere that she may be 1/2 draft. I would just check hunter type and if asked call her an American warmblood cross. The reason for this is it will open up more potential show opportunities as not all pinto shows have all the "utility" (draft) classes.
Pinto registration can be done completely by email too. You fill out this form http://www.pinto.org/information/12_registration.pdf
using the credit/debit card option and then print/sign/scan or even take a clearly readable photo of it then email it to firstname.lastname@example.org
with the subject line being "Registration of _____" the blank is your 1st name choice. Also in that email send 4 separate image files (left, right, front, and rear or the horse). All you have to write in the body of the email is "attached is my registration application and photos. Thanks. Name & address"
As far as testing for frame, it's a great idea and inexpensive as well, but if you only breed to a negative tested stallion, you wouldn't have to pay for that test.
As large as she appears to be, you may also want to consider AI because it will be easier on a smaller stud, and will open up a wider variety of stallions to choose from. Getting papers for your mare may also get her approved by more stallion owners than not having any at all. Posted via Mobile Device